This is a scan of the tinpet of the old Hasbro line of medabot toys. Each toy kit came with a poseable pewter skeleton "tinpet" which you attached different plastic armor pieces to.

Considering that the tinpet was made of pewter and the armor was made of cheap plastic, 17 years later I still have the tinpet but no armor. With this CAD reconstruction of the tinpet, I've been making my own medaparts for it, and you can too.

The model here is not necessarily for printing, but is rather a base to subtract from your medaparts to make them fit onto your tinpet.