Make has an article on experiments in using bioplastic in distributed manufacturing devices - Is homemade bioplastic viable fodder for 3D printers?.
We recently posted a video showing how to make "bioplastic" -- an easily manageable substance made with vinegar, glycerine, starch, and water. Even better, it's biodegradable.
This recipe has created a modest amount of buzz. MAKE reader Matt Daughtrey has been playing around with the stuff and Joris of the Shapeways Blog recently posted a how-to.
The big question is, can this be a DIY source of plastic for 3D printers? With ABS plastic sold at the MakerBot store for fifty bucks a reel, the prospect of creating your own has got to tempt home fabbers. According to Joris, the bioplastic made with this technique doesn't look too promising ...