1. Yes, but not all colors come out as expected. Sort of like an early generation inkjet printer.
2. Yes, unless you can break up your model into monochrome parts that can be produced in
colored nylon. See the materials pages for details and design guidelines.
The "sandstone" is actually gypsum powder held together by superglue. Rough, sandstone-like surface
but feels more like plastics with a heavy filler. Also much more fragile than the nylon
(but can easily be repaired with - you guessed it - superglue)
If in doubt (and time permits), buy the materials sample kit, or buy one of the "full color sandstone" figurines
available in the shops, such as kspaho's anteater or this little blue froggy