This Houston company is 3D printing homes with eco-friendly materials

future of construction

HIVE 3D is bringing science fiction to reality with this Texas project. Photo courtesy of HIVE 3D

While it may be true that the mother of invention is necessity, in today’s startup market, a more important factor is disruption. That’s where HIVE 3D, a Texas-based leader in constructing eco-friendly 3D printed homes, flourishes.

HIVE 3D was already revolutionizing the home-builder industry with its lightweight gantry system and mobile robotic arm system to 3D print its homes, but it took a giant leap further with its partnership with Utah-based Eco Material Technologies, North America’s leading producer of sustainable cement alternatives.

Together, they are building the world’s first near-zero-carbon, 3D-printed homes. Using Eco Material’s cement mixture called PozzoCEM Vite, which has 92 percent lower emissions than traditional concrete that can set in just a few minutes, they are focusing on providing a sustainable, cost-efficient and affordable housing solution.

“We want our homes to last 1,000 years,” Timothy Lankau, CEO, Hive 3D CEO, tells InnovationMap. “We want archaeologists to dig them up and wonder what they were. I mean, you go to the Parthenon in Rome, and it looks similar today to how it did 2,000 years ago because the materials are so stable.

“Concrete's just a very stable material. It doesn't change over time, and that's also why building with stone and masonry is important for the future. We think it's more sustainable because it's ultimately going to be better in terms of longevity.”

Key collaboration

Eco Material Technologies and HIVE 3D’s collaborative mission began through a mutual desire to develop sustainable and eco-friendly solutions for the construction industry.

“Both companies recognized the pressing need to reduce the environmental impact of traditional construction materials and processes and the need for affordable, high-quality housing,” says Grant Quasha, CEO of Eco Material Technologies. “The partnership between the two companies began when Eco Material Technologies reached out to HIVE 3D to explore the potential of incorporating their eco-friendly materials into 3D printed construction.

“HIVE 3D recognized the opportunity to combine their expertise with sustainable material solutions. The finished product of this collaboration is an eco-friendly construction material that can be 3D printed into various structural elements like walls, floors and columns.”

Proof of concept

Photo courtesy of HIVE 3D

HIVE 3D’s first full project, a 3,150-square-foot home located in Burton, Texas, was printed with a rotating team of just four people using PozzoSlag, which replaces 50 percent of the portland cement in concrete and has been used in roads and bridges in Texas for over a decade.

The home used several innovations that hadn’t been used in a 3D printed house before, including parametric wall designs, foamcrete wall insulation, and pigmented concrete layers.

“Our product is more sustainable because it utilizes proprietary technology that allows for the use of alternative materials to replace the clinker and processes from traditional cement that contribute to its high emissions,” says Quasha. “It is estimated that the portland cement industry contributes to 8 percent of global emissions annually, but by utilizing Eco Material Technologies' cement replacement solutions ... builders can significantly decrease their carbon emissions without compromising on the product's setting time or long-term strength."

Each ton of portland cement replaced by a ton of Eco Material's products, PozzoSlag or Pozzocem, reduces emissions by close to one ton, Quasha explains.

The Calais project, located in Round Top, Texas, behind the Halles, an antique shopping and design destination, broke ground in March 2023 and will feature a collection of tiny homes known as casitas, including studio, single-bedroom and two-bedroom models, ranging from 400 to 900 square feet.

“These small homes will serve as a model for affordable and eco-friendly housing throughout the country,” says Lankau. “We plan to build them at a speed and cost point that is unprecedented in the affordable housing space.

“Ultimately, we want to build houses at a disruptive price point. We want to be vertically integrated and put our homes on the market at a significant discount to market wherever they are. And by significant, we're talking 20 or 30 percent. That's our goal.”

The right resources

Photo courtesy of HIVE 3D

HIVE 3D worked with CyBe Construction to create a mobile construction 3D printer and mixing system that allows the printing mortar to be mixed onsite, which eliminates a significant amount of labor and time, which means those savings can be passed on to the consumer.

“We worked with a company called CyBe in the Netherlands to build a robotic arm, and that arm has about an 11-foot reach, and it can go all the way in a circle around itself,” says Lankau. “So, it drives around the foundation of the house, printing sections of the house at a time. So, it'll print a section, drive to the next section, and print the next section.

“So instead of having this many different materials and these many different traits, people that do all these different things, we have a machine that just uses one material and prints the wall.”

HIVE 3D has an internal engineer that works through all of the structural issues that may come up on projects and helps them build homes with monolithic, foot-thick concrete walls with rebar and steel supported in them.

According to Lankau, their 3D printed homes are tornado-proof, hurricane-proof, pest-proof, bullet-proof and can virtually withstand anything because of the sustainable materials used to build them.

“They're everything-proof,” says Lankau. “Just because of the natural strength of the concrete and the steel we use to create them, they can support millions of pounds. So, it's actually a stronger material than a typical house. By a factor of 100. Like I said, it's bulletproof and tornado-proof. You could drive a car into it, and it would total the car. I mean, it's a very, very sturdy structure.”

A bright future

Photo courtesy of HIVE 3D

Moving forward, HIVE 3D would like to continue to innovate and advance its 3D printing technology by leaps and bounds.

“The science fiction goal here, which is maybe a five-year goal, is to be able to drive onto a site, press a button, and watch the robots work,” says Lankau. “We want to be a significant home builder. So, in five years, we want to be building a lot of houses quickly and affordably and we want to continue to automate more and more of the process.”

Right now, there is no formal process for commissioning a HIVE 3D printed home. Perspective customers are directed to the website, then put in a request to build a home, go through a screening process and if the project is a good fit, they'll put that project into their pipeline.

“We can build them quickly. It's just a matter of getting to them,” says Lankau. “We're also going to be doing some developments in Texas probably to start. We also have some international things that we'll be looking into next year. But right now, it's mostly in Texas. We'll be building some developments and putting those homes on the market. We hope to have some out this year and then a bigger chunk next year as we get more machines working. Those will be announced on our website.”

As HIVE 3D continues to find ways to scale its business model, there is a laser focus on the diminishing idea of the “American Dream,” where young families are able to purchase their first home. With the rising costs of supplies and labor, those families have been priced out of the market.

“That’s almost all we think about,” says Lankau. “Homeownership and that part of the American Dream is really struggling right now because the affordability gap between what the average person makes and what the average house on the market costs is just getting wider and wider.

According to Lankau, there are a lot of options to address the supply gap, but there aren’t an equal number of options to solve the affordability issue. Their goal is to find the best ways to deliver real cost savings over both traditional construction and other automated technologies.

“About three weeks ago, we kind of hit the inflection point in our current project where we printed a little house in three days. The cost of the house was what we wanted the cost to be, which is a disruptive amount less than what you could do traditionally or with any other construction technique. And we said, okay, now we're far enough along. We have this system. It's a scalable system. So, we're right now putting some capital together to go out and buy, build more of these machines and get out and start doing these truly affordable housing projects. Because that's where our heart is. Our heart's on the affordable side.”

HIVE 3D’s project in Burton, Texas isn’t available for sell yet, but it will be listed on Airbnb for interested customers to go and experience when it’s completed.

Additionally, the Casitas units in Round Top will be short-term rentals for festival patrons.

“We’ll go directly to market with our next projects,” says Lankau. “And then we'll sell that big house property in Burton at the end of this year.”

From Your Site Articles
Rice University announced a new partnership between two tech companies to allow for the community to have access to prototyping tools. Photo via Rice

Rice University taps 2 partners to increase access to prototyping technology

3d printing upgrade

A Houston university has entered into partnerships with two businesses to provide on-site prototyping and additive manufacturing services and equipment.

Rice University’s Office of Innovation announced its partnerships with Redwood City, California-based Carbon and Austin, Texas-based manufacturer TyRex Group today. The arrangement includes making additive manufacturing equipment, prototyping, and design facilities and services available on campus.

“Collaboration is the fastest way to get technology out of the lab and into the real world,” says Paul Cherukuri, vice president of innovation at Rice, in a news release, adding that 3D printing "allows you to create things you couldn't otherwise make, and it lets you go very quickly from an idea to a prototype and downstream to a product.”

Carbon's platform — which includes end-use materials, software, and 3D printers — allows users to rapidly design and develop products quickly. At the same time, TyRex’s expertise with manufacturing complements Carbon's technology. Together, the two entities provide the support for turning “proof-of-principle” ideas into viable prototypes.

Cherukuri has first-hand experience with these two businesses, per the release. In 2021, he pitched an idea for 3D-printable smart helmets to the Office of Naval Research. The Rice Smart Helmet reimagines a military helmet that has both protective equipment and a wearable technology platform. The Navy's funding allowed Cherukuri to purchase "two of Carbon’s industrial-grade 3D printers, an M2 model that was installed at Rice for smaller prints and a top-of-the-line, large-format L1 that was installed at TyRex’s Austin facility almost 170 miles from the Rice campus," reads the release.

Cherukuri says the technology allowed the project to “go seamlessly from idea to production,” and he wants to replicate that experience for other labs at Rice. “If I design on the L1, I can hit print and print 1,000 of them, and that is a capability we did not have before,” Cherukuri says in the release.

The technology will be available at the Rice Nexus, based in the Ion and expected to open this summer. Cherukuri recently shared more details on and the potential of the hub on the Houston Innovators Podcast.

"We've got so much technology in our labs that we've never shared with the world," Cherukuri says. "We're going to demonstrate that in the Ion."

The Rice Smart Helmet is an example of the work that can be done through this 3D printing partnership. Photo via Rice.edu

Two innovators are bringing additive manufacturing opportunities to Houston. Image via Getty Images

New venture brings next-generation additive manufacturing to Houston

new to hou

Last year, Sean Harkins introduced his friend Brien Beach to the world of additive manufacturing, and together the duo saw a business opportunity not only for themselves — but also for all of Houston.

Harkins had been working in 3D printing and additive manufacturing — the process of creating an object by building it one layer at a time — for the last decade and studied industrial design at the University of Houston. Working together, Harkins and Beach launched AmPd Labs, Houston’s next-generation additive manufacturing facility for industrial design and production.

“I met Brien through a mutual friend and we started discussing this idea of an additive manufacturing center in Houston,” says Harkins, president of AmPd Labs.

AmPD Lab’s focus is to break down traditional engineering design constraints, forcing the question “can this be additively manufactured?” The facility uniquely enables the printing of metals through metal binder jetting technology.

Last week, the company opened its first dedicated space near the Heights that was built to be the production studio as well as a place to bring in potential partners interested in additive manufacturing.

“There is a hill to climb with market acceptance, but we want to be the champions of that and Houston is just a great place to start this because it's the largest industrial city in America and there's so much industry here and there's tons of engineers in this community,” says Beach. “Houston is such a business-forward place. A ‘how can I help you’ type of business place.”

In addition to the launch of the new facility, Beach and Harkins visualize they will soon create a trade-school-type concept of “Digital Craftsmen” for additive manufacturing and offer an educational platform to help build a skilled workforce in this space.

“AM is not a fit for everything, but by working together, we can find those parts and products in which an AM solution can give you an operational or competitive advantage,” says Beach. “We will work with you through the design process, provide samples for testing, work through parts quality and qualification, and eventually find some products that you can permanently implement into your business.”

AmPd Labs will focus its business on these dedicated areas of impact:

  • Manufacturing technology choice
  • Part design
  • Material selection
  • Material performance
  • Assembly and workflow assessment
  • Business model impact
  • Supply chain impact
  • Increased data generation
  • Sales and marketing approach

Sean Harkins and Brien Beach opened AmPd Labs' space in the Heights last week. Images via ampdlabs.llc

This innovative Houston company has the national spotlight this week. Courtesy of re:3D

Houston 3D printing company selected inaugural competition

winner, winner

A Houston company has been announced among the winners of an inaugural seed fund expo competition.

Twelve startups were announced across four categories in the U.S. Small Business Administration's inaugural America’s Seed Fund Startup Expo 2022, which is taking place virtually Wednesday, May 25, from 11:30 am to 3:30 pm. Each of the 12 companies have developed innovative technologies with the help of SBIR grants.

“Every day, in communities across America, entrepreneurs are solving our nation’s most pressing challenges from climate change to feeding and healing the world. The SBA is committed to helping ensure that those ideas receive the necessary support from federal programs and innovation ecosystems so that they can commercialize and grow into resilient businesses,” says Administrator Isabella Casillas Guzman in a news release.

“With the launch of America's Seed Fund Expo, we will showcase exceptional entrepreneurs who have leveraged federal research and development funding through the SBIR Program in key industries and connect them to resources to advance their game-changing innovations right here in America,” she continues.

Houston-based Re:3D is among the companies selected to present at the expo. The complete list of participating companies is as follows:

  • AgTech and Food Security
    • General Probiotics (Saint Paul, MN)
    • Nucleic Sensing Systems (Saint Paul, MN)
    • Shellfish Solutions d/b/a Blue Trace (Castine, ME)
  • Climate and Energy
    • Amorphic Tech (Allentown, PA)
    • FGC Plasma Solutions (Middleton, MA)
    • Hydroplane (Lancaster, CA)
  • National Security and Defense
    • BadVR (Pacoima, CA)
    • Enduralock (Lenexa, KS)
    • PSYONIC (Champaign, IL)
  • Supply Chain Resiliency
    • Chromatic 3D Materials (Golden Valley, MN)
    • Delta Development Team (Tucson, AZ)
    • Re:3D (Houston, TX)

“The giants of future industries so often start as small business startups with big ideas," says Bailey DeVries, associate administrator of the office of investment and innovation, in the news release. "We know the public and private sectors must work together to nurture these small businesses with big ideas over many years so they may sustain and grow. America’s Seed Fund Startup Expo will lift up big ideas and provide a platform for our national innovation community to support the businesses of tomorrow."

The event is free to attend virtually, and anyone can register online at https://bit.ly/SeedFundExpoRSVP. The America’s Seed Fund is among the Small Business Innovation Research and Small Business Technology Transfer programs and is collaborates with 11 federal agencies, that collectively support more than $4 billion a year in federal research and development funding.

Roboze has closed its latest round of funding. Photo courtesy of Roboze

Houston 3D printing company closes latest round of funding, plans to hire

money moves

Roboze — an Italian high-performance 3D printing company with its U.S. headquarters in Houston — closed a multimillion-dollar round of funding this month with investments from an international group of leaders from diverse backgrounds.

Investors include Nova Capital, Lagfin, Andrea Guerra, Luigi De Vecchi, Roberto Ferraresi, Luca Giacometti, Denis Faccioli and others, according to a statement.

“We are honored to have a group of investors of this caliber, who strongly believe in the vision of Roboze and in the change of production paradigm that our technology is enabling by replacing metals and producing parts without wasting raw materials," Alessio Lorusso, founder and CEO of Roboze, said in a statement.

Roboze aims to put the funds towards the research and development of a new "super material" developed in the company's R&D facility in Italy, where the company is also building a new chemistry lab.

The company added that it will also be implementing an aggressive hiring plan in 2022, hiring 60 experts in the next 12 to 18 months in fields such as materials science, chemistry, business development, aerospace, medical devices, and field and applications engineering. Half of the new jobs will be based in the U.S. while the others are slated to be located in Italy and Germany.

Roboze specializes in manufacturing industrial 3D printing technology, such as its ARGO1000, which the company says is the largest printer of its kind. Through a process called Metal Replacement 3D Printing, the company uses super polymers and composites like PEEK and Carbon PEEK to create large-scale, end-use parts for an array of industries—from aeronautics equipment to medical manufacturing.

The company currently works with GE, Bosch, and Airbus, among others, and announced in the statement that manufacturing giant Siemens Energy acquired its first 3D printer from the company.

"We think additive manufacturing is playing a key role in digitalization and cost out in the energy sector. At Siemens Energy we evaluated many companies and found that Roboze technology for high temperature polymers has met our engineering qualification and expectations," Andrew Bridges, Service Frame Owner at Siemens Energy, said in a statement. "As a result, we acquired our first machine and look forward to expanding our relationship with Roboze."

Rice University bioengineers are designing a vascularized, insulin-producing implant for Type 1 diabetes. Photo by Jeff Fitlow courtesy of Rice University

Rice University bioengineers create insulin-producing medical device

health tech

A team of bioengineers at Houston's own Rice University have created an implant that can produce insulin for Type 1 diabetics. The device is being created by using 3D printing and smart biomaterials.

Omid Veiseh, an assistant professor of bioengineering, and Jordan Miller, associate professor of bioengineering, have been working on the project for three years and have received support from JDRF by way of a grant. Veiseh has a decade of experience developing biomaterials that protect implanted cell therapies from the immune system an Miller has spent more than 15 years specializing in 3D print tissues with vasculature, or networks of blood vessels.

"If we really want to recapitulate what the pancreas normally does, we need vasculature," Veiseh says in a news release. "And that's the purpose of this grant with JDRF. The pancreas naturally has all these blood vessels, and cells are organized in particular ways in the pancreas. Jordan and I want to print in the same orientation that exists in nature."

The challenge with Type 1 diabetes is balancing insulin intake, and studies estimate that less than a third of Type 1 diabetics in the U.S. are able to achieve target blood glucose levels consistently. Veiseh and Miller are working toward demonstrating that their implants can properly regulate blood glucose levels of diabetic mice for at least six months. To do that, they'll need to give their engineered beta cells the ability to respond to rapid changes in blood sugar levels.

"We must get implanted cells in close proximity to the bloodstream so beta cells can sense and respond quickly to changes in blood glucose," Miller says, adding that the insulin-producing cells should be no more than 100 microns from a blood vessel. "We're using a combination of pre-vascularization through advanced 3D bioprinting and host-mediated vascular remodeling to give each implant several shots at host integration."

Another challenge these experts are facing is a potential delay that can happen if the implant is too slow to respond to high or low blood sugar levels.

"Addressing that delay is a huge problem in this field," Veiseh says. "When you give the mouse — and ultimately a human — a glucose challenge that mimics eating a meal, how long does it take that information to reach our cells, and how quickly does the insulin come out?"

By incorporating blood vessels in their implant, he and Miller hope to allow their beta-cell tissues to behave in a way that more closely mimics the natural behavior of the pancreas.

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Houston hospitals recognized as best in state, nation in annual report

better than all the rest

Houston’s University of Texas MD Anderson Cancer Center has retained its U.S. News & World Report crown as the best cancer hospital in the U.S.

In the same ranking, Houston Methodist Hospital once again came out on top as the best hospital in Texas. Last year, the hospital shared the top spot. Baylor St. Luke’s Medical Center ranked No. 4, followed by No. 5 Memorial Hermann Hospital.

The accolades appear in U.S. News’ 2024-25 ranking of the country’s best hospitals. Each hospital also ranked among various specialties, such as orthopedics; cardiology, heart, and vascular surgery; cancer; and neurology and neurosurgery.

Since U.S. News introduced its annual hospital survey in 1990, MD Anderson has been ranked one of the two best U.S. hospitals for cancer care. It has maintained its No. 1 ranking for 10 consecutive years.

“At MD Anderson, our mission is clear: to end cancer,” Dr. Peter WT Pisters, president of MD Anderson, says in a news release. “This ranking reflects our relentless commitment to excellence in patient care, research, prevention, and education.”

MD Anderson also ranked highly in three specialties:

  • No. 2 for ear, nose, and throat.
  • No. 9 for urology.
  • No. 14 for gastroenterology and GI surgery.

“The consistent top national recognitions [that] MD Anderson receives for delivering compassionate, evidence-based care is a testament to our dedication to those we serve,” Pisters says.

Elsewhere at the Texas Medical Center, Houston Methodist Hospital was named the No. 1 hospital in Texas for the 13th year in a row. Also, it was lauded as one of the country’s 20 best hospitals for the eighth time.

Along with the general ranking, Houston Methodist Hospital scored high marks in 10 specialties. These include diabetes and endocrinology (No. 6), gastroenterology and GI surgery (No. 7), and pulmonology and lung surgery (No. 8).

Meanwhile, four Houston Methodist community hospitals ranked well in Texas:

  • Houston Methodist The Woodlands Hospital (No. 8).
  • Houston Methodist Sugar Land Hospital (No. 9).
  • Houston Methodist Baytown Hospital (tied at No. 18).
  • Houston Methodist Willowbrook Hospital (tied at No. 23).

New app with tips for solo women travelers takes flight from Texas

explore mode activated

We all have that one friend whose office seems to be the nearest airport gate. We go to them for travel advice and hit save on their latest post for that hole-in-the-wall restaurant that had the best local food. That type of advice — especially between women — is indispensable for solo travelers, and now a new travel app based in Austin is helping organize it on a new platform without the social media noise.

Solo travel has gained a lot of momentum in the past few years, and it’s no longer just something one does during a gap year before or after college. It’s become the preferred way to travel for many, and women are at the forefront.

According to Condor Ferries, 72 percent of American women like to take solo trips, and the term “female solo travel” has increased 62 percent over the past three years across all search engines. What if there was a place where women solo travelers could get recommendations and travel itineraries created by other solo women travelers?

This concept is the backbone of Airheart, which aims to revolutionize the travel industry by offering a safe space for solo female travelers to find itineraries and travel guides that were crafted with them in mind.

"Traveling solo as a woman is an empowering act of independence," said Airheart founder Lindsey Renken in a press release. "At Airheart, we celebrate and support this journey, helping women discover new places, connections, and strengths."

The platform includes integrated planning tools, interactive maps, itineraries, and video tips all conveniently located in one place and customizable to the traveler’s preference. Once a user creates an account and accesses the site, the navigation is pretty straightforward.

There’s an explore option at the top of the home screen showcasing all the travel guides available for purchase within the platform, with destinations all over the world. At the moment, most are within the US, Mexico, Western Europe, and Asia. Once the user chooses a guide, a sidebar populates with a list of recommendations or a day-by-day itinerary. The right side of the screen is a map with all the pinned recommendations for easy navigating.

For those wanting to travel more within Texas this summer, Airheart offers a few destinations with a wide range of activities:

  • Big Bend/West Texas: For nature lovers, explore the beautiful mountain desert region of West Texas with a comprehensive guide that includes tips on how to get there and how to choose the best accommodation for your trip — something that becomes more complex in such a remote place.
  • Glen Rose: Escape to this charming small town just an hour-and-a-half Southwest of Dallas-Fort Worth, that is perfect for a weekend getaway full of outdoor adventures. These recommendations come from a local.
  • Fredericksburg: Indulge in the best wineries and restaurants that Central Texas has to offer with an itinerary crafted by a Texas native. This one is ideal for a quick day trip or a fun girls’ weekend.

Airheart, named after the pioneering aviator Amelia Earhart, is also focused on empowering female travel creators by allowing them to act as a type of modern travel agent. They can monetize both new and existing travel content by creating these guides and itineraries, while reaching a new audience on the platform.

“As an avid traveler, I’m always looking for something like this created by expert travelers. I can’t wait to be a seller and consumer,” said Tanna Wasilchak who contributed guides for Waco, Glen Rose, and Georgetown. “Solo traveling as a female can be intimidating at first, but it’s one of the most rewarding experiences I’ve ever had. Airheart is going to be such a game changer for this community.”

Perhaps the only downside for now is that Airheart is limited in what it can offer to its users with only 22 guides published on the site. However, the features and community-based aspect give the platform the potential to stand out in an otherwise saturated market. Guides ($29 each before taxes and fees) are available for users to browse and purchase at airheart.com.

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This article originally ran on CultureMap.

Houston startup adviser on navigating SAFE, convertible notes in funding rounds

guest column

As both a founder and occasional early-stage investor in the Houston ecosystem, I've seen firsthand the opportunities and challenges surrounding seed funding for local startups. This critical first fundraising round sets the trajectory, but navigating the landscape can be tricky, especially for first time founders who may not be familiar with the lingo.

One key dynamic is choosing the right deal structure — SAFEs (Simple Agreement for Future Equity) vs. convertible notes are the most common vehicles early stage startups use to raise capital and are far more founder-friendly than a priced round.

Let's start first with what the have in common:

  • Both allow you to defer setting a valuation for your company until a later (likely priced) round, which is useful in early stages or pre-revenue companies
  • Both are cheaper and faster to execute than a priced round, which cash-strapped early stage founders like
  • Both can have terms like valuation cap, discount, conversion event, and pro rata rights.
  • Both are less attractive to investors seeking immediate equity (especially important if starting the QSBS clock is part of your investors strategy or if the investor is newer to startup investing)
  • Both can create messy cap tables and the potential for a lot of dilution for the founders (and investors) if they are used for multiple raises (especially with different terms)

While as you can see they have similarities, they have some important differences. Let's dig in on these next:

SAFEs:

  • Created by Y Combinator in 2013, the intent was to create a simplified, founder friendly agreement as an alternative to the convertible note
  • Is an agreement for future equity for the investor at a conversion event (priced round or liquidation event) which converts automatically.
  • It's not a debt instrument and does not accrue interest or have a maturity date.
  • Generally have much lower upfront legal costs and faster to execute

Convertible Notes:

  • A debt agreement that converts to equity at a later date (or conversion event like a priced round)
  • Accrues interest (usually 2 to 8 percent) and has a maturity date by which the note must either be repaid or convert to equity. If you reach your maturity date before raising a qualifying round, you can often renegotiate to extend the maturity date or convert the note, though be prepared to agree to higher interest rates, additional warrants, or more favorable conversion terms.
  • More complex and take longer to finalize due to non-standard terms resulting in higher legal and administrative costs

It's worth reiterating that in both cases, raising multiple rounds can lead to headaches in the form of complex cap tables, lots of dilution, and higher legal expenses to determine conversion terms. If your rounds have different terms on discounts and valuation caps (likely) it can cause confusion around equity and cap table structure, and leave you (the founder) not sure how much equity you will have until the conversion occurs.

In my last startup, our legal counsel — one of the big dogs in this space for what it's worth — strongly advised us to only do one SAFE round to prevent this.

Why do some investors tend to prefer convertible notes?

There are a few reasons why some investors, particularly angel investors from developing startup ecosystems (like Houston), prefer convertible notes to SAFEs.

  • Because they are structured as debt, note holders have a higher priority than equity investors in recovering their investment if the company fails or is liquidated. This means they would get paid after other creditors (like loans or credit cards) but before equity investors, increasing the likelihood of getting some of their money back.
  • The interest terms protect investors if the founder takes a long time to raise a priced funding round. As time passes, interest accumulates, increasing the investor's potential return. This usually results in the investor receiving a larger equity stake when the note converts. However, if the investor chooses to call in the note instead, the accrued interest would increase the amount of money owed, similar to a traditional loan
  • More defined conversion triggers (including a maturity date) gives investors more control and transparency on when and how their investment will convert.
  • Can negotiate more favorable terms than the standard SAFE agreement, including having both a valuation cap and a discount (uncommon on a SAFE, which usually only has one or the other), interest rates, and amendment clauses to protect them from term revisions on earlier investors by future investors (called a cram-down), etc.
We'll go over what the various terms in these agreements are and what to look out for in a future article

How to choose:

  • Consider your startup's stage and valuation certainty — really uncertain or super early? Either of these instruments are preferable to a priced round as you can defer the valuation discussion
  • Assess investor preferences in your network — often the deciding factor if you don't have a lot of leverage; most local angels prefer c-notes because they see them as less risky though SAFEs are becoming more common with investors in tech hubs like Silicon Valley
  • Evaluate your timeline and budget for legal costs — as I mentioned, SAFEs are way less expensive to execute (though still be prepared to spend some cash).
  • Align the vehicle with your specific goals and growth trajectory

There's no one-size-fits-all solution, so it's crucial to weigh these factors carefully.

The meanings of these round terms like "seed" are flexible, and the average seed funding amount has increased significantly over the past decade, reaching $3.5 million as of January 2024. This trend underscores the importance of choosing the right funding vehicle and approach.

Looking ahead, I'm bullish on Houston's growing startup ecosystem flourishing further. Expect more capital formation from recycled wins, especially once recently minted unicorns like High Radius, Cart.com, Solugen, and Axiom Space exit and infuse the ecosystem with fresh and hungry angels, new platforms beyond traditional venture models, and evolving founder demographics bringing fresh perspectives.

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Adrianne Stone is the principal product manager at Big Cartel and the founder of Bayou City Startups, a monthly happy hour organizer. This article original ran on LinkedIn.

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