Geeetech Prusa I3 pro W Building Instruction page 47

Shenzhen GETECH CO.,LTD
1. The opening of both end, one is 5mm, another is 8mm, connect the 5mm hole to the
motor shaft.
2. Screw the jimmy screw of the 5mm part on the upper part of the flat side of the
motor shaft tightly; you can see the boundary in the inner of the coupling.
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