[thawkins]

Most 3d printers which also use gcode, have an sdcard slot. Load your gcode file onto the sdcard, plug it into the printer and print from there. You dont need a computer connected at all, so nothing to go to sleep.

[wlesieutre]

The 3d printers, yes. The Shapeoko 2 runs off of an arduino and gets its data over a serial connection.

At least that's my understanding of it. I've never used it myself, only watched it run for other people.