I am currently working on parts for a custom prosthesis.

My main concern at the moment is to find biocompatible materials that can be 3D printed from a UP or a Reprap. The piece would need to be in contact with the skin for extended periods of time, probably around 17 hours a day on average.

The main concerns I have are:

• Skin reactions caused by prolonged contact
• Skin reactions and bruising caused by friction
• Degradation of the materials due to prolonged exposure to skin secretions and sweat
• Risks of toxicity in the compounds generated by the aforementioned material degradation

Which materials can you recommend?

Any extensive data (from testing) would be greatly appreciated.