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[Sticky] The Sphere-o-bot

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DSC 1011 1

The Sphere-O-bot is an art robot that can draw on spherical or egg-shaped objects from the size of a ping pong ball to a large duck egg (4-9 cm).

The robot is based on the original design of Evil Mad Scientist.

This Sphere-o-bot can be created using:
2x 623 ball bearings
Threaded steel rod (3mmØ,80mm length) (not shown on the photo above)
1x compression spring (4,5mmØ, 10 mm length)
2x 1.8deg HIGH QUALITY NEMA 17 Stepper motors (40mm length) (4.4Kg/cm torque)
Motor cables (14+70 cms long)
USB cable
1x SG90 servo
Arduino Leonardo compatible
B-robot Brain Shield
2x A4988 Stepper motor drivers
Power supply 12v/2A
11x 6mm M3 bolts
4x 12mm M3 bolts
4x M3 nuts
2x 20mm Suction Cups
1x M3 wing nut
1x Sharpie PEN (not in the photo)

More info:
Do you already have an iBoardbot or a B-robot EVO? use the same electronics and motors to create your Sphere-o-bot