[johnwalkr]

I use ABS as a baseline, it holds up well, is easier to sand than most other materials, and is soluble in acetone which gives you some nice methods for smoothing layer lines as well as adhering parts together. It requires a heated chamber though.

[dghlsakjg]

ABS also emits potentially toxic, and certainly unpleasant, fumes, so you need a good carbon filter and ventilation system!