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Mão Dada

Projeto Mao Dada is an independent research project that aims to redefine and redesign prosthetic devices for children. 

Vine, 12 years old


In Brazil today, prosthetics are a luxury most people can’t afford. Ninety percent of the physically disabled population would have to give up a year’s income to purchase the simplest devices. Many people in low-income households are resigned to not using any prostheses, facing bullying and compromising their health and mobility. For children, it is even more difficult because they are growing and therefore need prosthetics that can be replaced and modified as they grow. Making matters worse, there is no governmental subsidy for child prosthetics.


Given that context, I was completely fascinated when I discovered that people were 3D printing these devices. 


However, when I gave Vine his first prosthetic, I understood that there is a fundamental uniqueness when making upper-body prosthetic devices for kids. When dealing with lower-body devices, the function is of the essence, but in upper-body, there is an enormous psychological factor that comes into play.


That changed everything. 

Giving Vine a prosthetic was not about restoring motor functions. He was born without an arm so he didn’t really miss it. What he missed and wished for was to be treated like a normal kid and not the kid without an arm.

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Vine and I at the lab fitting our V3

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Design Process and breakthrough:

Making Modular Prosthetics

Bodily proportions are unique and mutable

We realized that one of the challenges with the open-source files available was that they assumed that every user had the same bodily proportions, which is not true. In order to address this, we mapped rates and areas of growth in children and decided to pursue a five-part design. This enables anyone to adjust the device without the need for specialized software or skills. 

Partial Replacements - faster and cheaper

Another important insight we uncovered was user frustration with device maintenance, that often would imply a full replacement when a minor component malfunctioned, which resulted in increased (and often unsustainable) costs. Once again, by having separate components in our design, we would be able to perform a partial replacement which would be cheaper, simpler and faster. 

Longer Product Life - economic sustainability

Partial replacements also contribute to a longer product life making it economically and ecologically sustainable. The same prosthetic can now keep up with a child’s growth by undergoing minor modifications.

Economies of Scale - financially accessible

The fact that the same base design can be used in many users makes its production a lot cheaper and simpler by allowing for economies of scale. That would enable clinics to keep stock of our product and assemble then by demand drastically reducing the total time spent on this process as well as the costs of importing devices. 

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Yan, holding the v5 we built: easily adjustable arm length and finger tension. 


When I realized the potential of this project, I was also very aware of the diverse sets of skill sets needed to make it successful. I managed to bring together a team of passionate people that covered the areas of finance, engineering, and marketing. But of course, this “we” also encompasses the doctors, occupational therapists and other healthcare professionals that were priceless in their input, the over 150 people who supported our crowdfunding campaign and helped raise over $10,000 USD for research and, of course, Vine and his mother, who were invaluable participants in every iteration and development, not just contributing with insights but taking an active stance throughout development process.

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And who is “we” that I keep mentioning?

Witnessing such a powerful psychological process and how impactful yet potentially simple our solution was, motivates me to continue designing where resources lack and making these limitations fuel for our creativity. 

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Vine wearing the first device we printed for him.