Z-coupling for 8mmx8mm lead screws
thingiverse
Lead screws pair up perfectly with Z-couplings, which have a smooth press-fit mechanism. These couplers slide effortlessly onto 5mm stepper motor shafts and securely attach using a trusty M3 screw. If extra hold is required, simply glue the Z-coupling to the lead screw for an unbeatable connection.
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