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Please use the standard 57mm Rubik;s cube. Do not use a speed cube, or a cube with rounded-corner plates.

The grippers do need to hug the cube tightly and make full contact.

Our choice of servos was driven by cost-saving considerations, that is why the robot employs two kinds of servos (one cheap and one expensive.)

Please contact us directly via our contact form at www.otvinta.com for further help.