Low-temp moldable plastic - PCL
 

I just heard about the low melting temperature Polycaprolactone plastic (PCL), though no doubt some of you already know of it. Wish I'd known about it long ago, as it looks very useful for making prototypes and special adapters.

http://www.robotroom.com/Prototype-Plastic.html

http://en.wikipedia.org/wiki/Polycaprolactone