High quality ink-jet printers support PostScript. Unfortunately they use PostScript to render raster images. The motors are controlled by firmware. It moves the head back and forth to print raster images generated by PostScript code. So there is no easy way to control printer's motors or other hardware from a PostScript program.
PostScript has access to the file system. If printer's OS provides access to motor controllers via file system and security system allows writing to the files from the PostScript interpreter, then it is possible.