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Originally Posted by Hachiban VIII
What about hacking a printer?
It may not sound very creative, but you can get old printers for cheap and program the stepper motors (or replace them with something else).
If you want it to paint instead of squirt ink just replace the printer head with a brush.
It sounds a little too simple, so there's probably something I'm missing, but at least its a start.
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Yeah, there is something you're missing. The point here isn't to be able to airbrush. The point it to build a robot arm. The airbrushing is just sort of a bonus. I would be perfectly happy if all it did was dance around.