There was a time when most 3D printers used ABS plastic. It stinks, is probably bad for you, and tends to warp unless printed in a heated enclosure. So most people have gone to something else, mostly ...

Finishing FDM prints like this involves a triumvirate of sanding, paint, and putty. The specific approach will vary a bit depending on the type of plastic you print, too. For instance, PLA doesn't ...