AMS Spring 2023

Dozens of 3D Printed Lower Leg Prosthetics Are Being Produced at University of Toronto’s Critical Making Lab


Share this Article

univ logoStrides being made in 3D printing and prosthetics inspire me enormously because I know this technology is changing people’s lives in ways they never imagined. Learning about how expensive current prosthetics are and how arduous the task is for having them fitted — especially for children — makes it doubly exciting to think about the new world opened up to those who need replacement limbs.

In the Critical Making Lab at the University of Toronto, there is a room of 3D printed limbs being refined, with a focus on lower-leg replacements. While 3D printing is certainly changing the price structure and process for prosthetics, it is obviously an area where customization is required, and that can be repeated over and over for growing children. It’s never a one-size-fits-all game.

ginger coons, a PhD student at the Faculty of Information’s Critical Making Lab at the University of Toronto, is involved in working with Associate Professor Matt Ratto to get their lower-limb prosthetic just right. While the ‘legs’ at their lab crowded with 3D printed prosthetics have passed stress testing, the team is still searching for perfection in the correct width and ‘fill’ for supporting a human body.

“I think one of the things we take for granted when we talk about the availability of technology is that not everyone’s infrastructure is our infrastructure,” says coons (who prefers her name be spelled all lowercase).

Matt Ratto is an Assistant Professor and director of the Critical Making lab in the Faculty of Information at the University of Toronto.

Matt Ratto is an Assistant Professor and director of the Critical Making Lab in the Faculty of Information at the University of Toronto.

Working on the project since 2013, Ratto is in charge of the mission to find a solid prosthetic design to be used and 3D printed independently in developing countries once personnel there have the training. The comprehensive design Ratto and his team want to perfect needs to be relatively simple and affordable with a design that will be adaptable and easily self-taught. The central focus is on sustainability.

“The social relationships [between] these things matter a lot. And these things have got to be created, developed, made to be sustainable as much as the tech,” Ratto told Fast Company in an interview. “In fact you can’t even differentiate, you can’t even separate the tech from the social. They are irretrievably interwoven together. And I think this is the biggest problem with these kinds of projects, and with technology more generally.”

The prosthetics and designs they currently have in the works are to be tested for the first time next month at a Ugandan hospital, the Comprehensive Rehabilitation Services for Uganda (CoRSU).

With such an expanding group of designers from all disciplines who are passionate about creating 3D printed prosthetics — in this case, hands — research scientist Jon Schull from Rochester Institute of Technology has brought together several thousand volunteers from around the world to participate in e-NABLE, which will be coordinating with hospitals and working diligently to bring new technology and innovation to the world in the area of 3D printing with prosthetics.

The plan is simple: make a design that hospitals and medical professionals in developing countries can use in a self-taught method that offers affordable, functional 3D printed prosthetics for so many in need. With a network in place, and communication for feedback and revisions, the goal is to use the Critical Making Lab in Canada as a home base.

Currently, e-NABLE is working with a great number of volunteers using their own 3D printers to make parts while others assemble them, and yet others check to make sure they are correct and ready for use.

“While we’re doing a lot to make this easier and easier for people to do, there’s no particular reason to think that the person who needs one of these hands will also have the technical skills required to do design or customize or fabricate or fit one of these hands,” Schull explained.

Blue socket - Critical Making Lab

Blue socket – Critical Making Lab [Image: Ginger Coons, Via]

In Uganda, coons and Ratto plan to put their 3D designs and software to the test in a hospital, where they are giving all the tools to hospital staff to be able to 3D print the prosthetics themselves, from the initial scanning, modeling, and customization, to the digitial casting and then 3D printing.

“The next phase of this work is thinking about how the scaling works. Because you can’t scale out of a research lab. So this idea of a social innovation [or] social entrepreneurship company is what happens next,” Ratto said.

Rather than doing the work for others, Ratto and coons have embarked on what is challenging but most important — they are giving others the tools to perform crucial tasks independently. With so many needs to be filled around the world, it would be unrealistic to think that the project would work without independence and self-sustaining knowledge.

While a learning curve may be challenging at first, the reward will certainly be enormous — and priceless. The goal is to have sixty-five 3D printed prosthetics made for Ugandan children in the next year.

Do you know anyone who would benefit from a 3D printed prosthetic? How do you think 3D printing technology will change the world of replacement limbs? Tell us your thoughts in the Sustainable 3D Prosthetic Designs forum over at


Image: Ginger Coons, Via

Critical Making Lab

Critical Making Lab

Share this Article

Recent News

Japanese Chemical Company Pulls out of Business with 3D Printer OEM Carbon

Revolutionizing Manufacturing Floors with Binder Jet Metal 3D Printing – AMS Speaker Spotlight


3D Design

3D Printed Art

3D Printed Food

3D Printed Guns

You May Also Like

The Future of Directed Energy Deposition is Unbounded

“Well, that depends…” I said. “On what?” he said. “It depends on what you want out of the process,” I emphasized. “All I want is a finished metal part just...

Achieving Viable Serial Production with Additive Manufacturing

To make additive manufacturing (AM) a more common process for serial production, particularly laser powder bed fusion (L-PBF), the focus of development has been to find effective and efficient solutions...

Parts, Not Prints – AMS Speaker Spotlight

At the Additive Manufacturing Strategies (AMS) event in New York City I have the double pleasure of being involved in two panels:  Moderating the Future of DED and WAAM and...


XJet Builds Momentum Moving Into 2023 – AMS Speaker Spotlight

Moving into 2023, XJet continues to build momentum in the additive manufacturing (AM) industry, delivering state-of-the-art 3D printing solutions for metal and ceramic AM. NPJ Technology Underlying XJet’s cutting-edge line...