NEMA17 motor to Acme lead screw shaft coupling
thingiverse
To fit my NEMA17 stepper to an Acme 3/8" or 1/4" lead screw, I designed a slim shaft coupling. The collar has two M3 x 10mm tightening screws with recommended washers for better compression. A captive nut and hole for a M3 x 8mm (or 10mm) screw against the stepper's shaft prevents backlash. Tighten side screws first to avoid misalignment. Two STL versions are available: one for 3/8" lead screws, as shown in the photo, and another for 1/4" lead screws.
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