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this is a simple bowden arm for a kossel, the spring cup diameter is 11mm. you can use a bearing but i suggest a v-wheel and a small piece of tube to keep the filament brom binding. i used a small pice of carbon tube. the force applied to the spring cup is doubled on the wheel and can safely go up to 30lbs. you may also need a washer or two between the peg and the motor.