[chbot] Cardboard CNC

[Andrew Errington]

Following the recent mention for the new Cartesian XY platform I wondered
if anyone had seen this:
http://homofaciens.de/technics-machines-cnc-v3-0_en.htm

It is a CNC machine model made from cardboard and paperclips.  It can be
manually operated, or you can add continuous-rotation servos to it to make
a computer-controlled model.

I made one and converted the Arduino code to Python on a Raspberry Pi.  It
works!  In my Raspberry Pi class in school here I am having the students
make them.  It builds character, and the resulting model is very cool.

Best wishes,

Andrew
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