Coupler (Stepper to lead screw)
thingiverse
A tight coupler (tight to the axis, and tight in the rotation, but still allows a small angel error) 2xM4 screw 2xM4 hexnut Instructions The design allows shafts with different diameter to be mounted to each other easily. The attached STL's is for a 10mm lead screw and a ~6mm stepper motor axis. The force that the screw/nut gives seems to have fixed the axis perfectly. If it isn't enough it's an easy thing to improve the design with a "lockscrew" too.
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