Ping Robot Chasis
thingiverse
One of the simplest robot designs, it uses a ping pong ball instead of a coaster or a free wheel this was designed for 3 mm plywood things you'll need to assemble this 12 - M3 x 10 + nuts 4 - 45 mm spacer + screws + nuts 4 - 12 mm spacer + screws + nuts 1 - 4xAA Battery case 1 - standard sized ping pong ball 2 - plastic gearbox dc motor (Straight) + wheels also you'll need a driver and a microcontroller
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