i built a much nicer version once and it is QUITE difficult to drive the etch-a-sketch rigidly, as there isn't much mechanical support inside the machine. i end

i built a much nicer version once and it is QUITE difficult to drive the etch-a-sketch rigidly, as there isn't much mechanical support inside the machine. i ended up removing the knobs, adding steppers directly opposite to the shafts, and using a homemade bronze coupler. it worked very nicely but was ugly.