So how autonomous is 3D printed construction, really?

David Malott, CEO and Chief Architect, AI SpaceFactory
May 20, 2019
NASA 3D Printed Habitat Challenge champions AI SpaceFactory discuss the trials and tribulations of 3D printing and robotic construction.

After a week long reboot following their epic win in Peoria, IL, we had the opportunity to link up with our MARSHA-alpha teammate Christopher Botham for a full mission debriefing.

For those of you recently following us, MARSHA is our prototype Mars habitat, robotically 3D printed with materials indigenous to Mars. AI SpaceFactory was awarded in both the design and construction phases of NASA’s four year long, multi phase challenge, culminating in a thrilling 30 hour head-to-head final versus Penn State. We dubbed our 15-foot tall 3D printed prototype ‘MARSHA-alpha’, meaning it was our first attempt at constructing MARSHA, and certainly not our last.

Christopher is an original member of AI SpaceFactory’s design team who took up residence at Autodesk’s BUILD space in Boston, where he quickly learned the tools of the trade — and pushed it to new heights. If you saw the media coverage pouring out of Peoria, you might think Chris had been 3D printing and operating robots for years. The reality is that he started from scratch eight months ago.

“Transitioning from architecture to robotics came naturally because I’ve always had a mind for the technical aspects of my architecture work,” explains Chris. “The type of software that I was familiar and intimate with from my architectural training happened to translate well to some of the robotics.”

AI SpaceFactory’s First Print: “Arrival” made on October 10, 2018

As their first 3D constructs climbed higher and higher, Chris did more than build up his skills. He built up trust in his team: an ethos which they extended to new members as the team grew in size.  Ultimately, that proved to be the decisive factor in narrowly edging out Penn State. The team’s ability to react and improvise meant having to spend a lot less time stopping the print.  

The team became so efficient at making quick fixes on the fly that they resembled a Formula One pit crew more than a team of robot operators.

The team benefitted from having rehearsed complex maneuvers back at the lab in Boston. Still, they had never printed a complete MARSHA before stepping into the spotlight of the NASA finals. Murphy’s Law kicked in almost immediately.

We should point out here that nearly all ‘3D printed buildings’ are made in parts in a factory, shipped and assembled on site like traditional construction. We’re aware of only a handful of structures which have been printed out in the field, true to the vision of building on Mars — where AI SpaceFactory will meet Murphy’s Law head on.

MARSHA takes shape on the final day

As the clock ticked down to the final hour, the accumulation of tiny delays spread over 3 days of printing came to bear. Earlier in the day, Chris noticed a potentially fatal slump in the print caused by overheating of the biopolymer material. In a carefully choreographed maneuver, the team slowed the robot to a crawl to deposit more material to level out the print. Chris explains, “We had the same problem when we printed the Tub back in Boston. We fixed it then so we knew what had to be done.” Still, the slowing maneuver meant the print might not finish on time.

Then came the dramatic final minutes. The 3D print was several layers short but the team had yet to robotically place a skylight to enclose the structure. At issue was whether the opening at the top was too large for the skylight, since the full taper had not been achieved.

“It came down to the final second.” - Christopher James Botham AIA, Architect and Robotics Specialist

Realizing there wasn’t enough time to adjust the code to place the skylight on a slightly shorter MARSHA, Chris stood up and grabbed his flex pendant to manually control the robot. “So the last moments, when I was piloting the robot, it was blind,” recalls Chris. “Per the rules, I couldn’t be looking at what I was doing. My team had to guide me through the process and yell out instructions. As soon as the skylight got into place, I heard somebody... yell ‘Disengage’ meaning open the gripper and let the skylight go. I got it done with about two seconds left and maybe a second later I heard a big bang from the inside and it took me a few seconds to understand what it was, but looking up I couldn’t see the skylight anymore.”

The skylight had fallen through the hole and hit the ground; but for one brief, shining moment it was there.

Chris piloting the skylight into position in the final seconds of the NASA Challenge

While the team had fallen ever so short in crowing their achievement, the final day of testing and awards validated months of days and nights Chris spent in the lab away from friends and family. MARSHA’s unique 3D print material, a composite of biopolymer and basalt fiber, proved to be significantly stronger than its concrete competitor. In the final ‘crush test’, a 200,000 pound Caterpillar excavator bore its weight down on MARSHA.

Sure enough, the Caterpillar started lifting itself off the ground while MARHSA didn’t budge. It would take two Caterpillar machines doing a pincer move to eventually slice MARSHA into quarters. The machines drove away with the material, where the team used a saws-all to finish off the job. We put the pieces of MARHA back on our trailer headed for New York, where we will use it to demonstrate the most remarkable aspect of our super-strong material: it’s recyclable. AI SpaceFactory will be using the remains of the MARSHA-alpha prototype to 3D print our first Earth habitat, TERA, this Summer in upstate New York and open it to our first guests later in the year.

Remains of the day: MARHSA-alpha headed for the recycling container

So looking back, what are the lessons learned from MARSHA-alpha?

  • First, we developed a sustainable and recyclable material, made essentially of plants and rock, which outperformed concrete in every strength, durability, freeze-thaw, and quality test
  • Second, our material can be successfully extruded to create complex, high-performance forms with speed and precision. Since our material is recyclable, we can go out and print our Earth habitat version this summer
  • Third, we can use a single robot to both 3D print the structure and to autonomously place pipes, windows, and (next time) a skylight
  • Fourth, 3D printed construction is far from a fully autonomous process and requires human eyes on the print, practice, and improvisation
  • Fifth, we succeeded in printing what is believed to be the world’s tallest in-situ 3D printed structure in just 30 hours. Chris believes, “As far as our material is concerned we could print taller. The height itself doesn’t seem to be the problem. Someday it will be possible to 3D print a skyscraper.”

Most importantly, we learned that despite the highly visible robotics and high-tech design, our success came down to the efforts of young architects, who stepped up to the plate and swung for the stars.

Christopher James Botham AIA, Architect and Robotics Specialist

instagram: @christopherjamesbotham

Christopher  is currently an architect and robotics specialist at AI SpaceFactory. He holds a M-Arch from Columbia University and is a licensed architect in New York State. His academic and professional focus has been verticality, and how it affects the lives of those living and/or working in tall buildings. Christopher is the creator and founder of the On Verticality blog, which focuses on the human relationship to verticality. Previously, Christopher worked for the New York City and London offices of KPF as a parametric design specialist, and the Chicago office of SOM as a designer. He is also creator and founder of the World Architecture Map (WAM), an online building database that maps and tags relevant architecture around the world.

more articles
© AI SpaceFactory, All rights reserved.