some links to note:

product research

paper engineering kit, just found this one very similar in concept of construction.

growing tree toys

helpful/interesting





instructables The new planned home for my project after it is more developed and licensed for free noncommercial use under creative commons.

open prosthetics personally one of the most inspirational websites in with its user need based interactive product development. At the same time they keep the projects open source for all to benefit finding other revenue / donation sources.

an engineer using paper gears for mock up tests