Coupling 5 to 8 mm for trapezoidal lead screw
thingiverse
Coupling 5 to 8 mm works well with trapezoidal screw, known for good centring and reliability. You'll need 6 m3 nuts, along with 3 screws that are 6mm in diameter and 3 DIN913 or similar-sized 8mm screws - other options will work fine too. A recess is visible in the hole for the motor shaft; try to seal it there. Kisslicer can help you do this, but I'm not sure if other slicers offer this feature. You may need to drill a slightly larger hole for the motor shaft.
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