Quoted from Mancave:I think the only plastic choices are ABS or PLA.....could/quite likely be wrong about that
There are a bunch of options now. I have had a 3d printer for a year, still don't know how to use it (no instructions included), but I know it can take 6 different kinds of filament.
Quoted from KenLayton:I must assume there must be some plastic to feed into the machine that is stronger or weaker than others? For pinball use, you'd probably want stronger plastics. Are colors limited?
Yup, different materials have different properties of strength, hardness, brittleness, etc. So you choose a material suitable to the use of whatever you're printing.