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When he was growing up, Roly Mamani didn't have any toys so he created his own.
Nowadays, he's an expert toymaker who uses his skills to produce false arms and legs - prosthetic limbs.
While at university, Mamani specialized in engineering and electronics.
Later, he set up a workshop where he builds robotic toys.
On hearing a story of a person without hands, Mamani made a decision to produce a pair.
After he was successful, he joined his talents with 3D printing to develop more body parts.
Prosthetic limbs aren't supplied by the Bolivian government, but there are more than 36,000 people in need.
A basic 3D printed arm or leg can cost five times the minimum salary.
The toymaker, together with his brother Juan Carlos - a physiotherapist - choose which people to help.
They cover a large part of the costs which are required for production, thanks to the sale of the robotic toys.
With a brand new arm, Pablo Matha now earns an income from his guitar playing.
Another musician, Marco Antonio Nina, can now hold his microphone much longer.
As Mamani's work is now widely known, he's planning a new centre where people can learn how to use their false limbs properly.
For this toymaker, science is his superpower.
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