R-CNC Z-Nut ACME lead screw
thingiverse
!!! [EDIT 05/03/2018] !!! -> https://www.thingiverse.com/thing:2815890 Z-Nut for ACME lead screw designed to fit perfectly. Just purchase a 250mm ACME lead screw with 2mm lead from China, available at an affordable price of 4-5€. Cut the screw to a length of 222mm for optimal performance. Select four M3*30 (or alternative options such as M3x40) screws or bolts for secure attachment. Direct screwing into plastic is also possible. In your firmware, set the steps per unit to 3200 for a 32 microsteps driver or 1600 for a 16 microsteps driver for seamless operation.
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