Nema 17 Stepper 25mm driver pulley
thingiverse
This driver pulley complements my 608zz Idler Pulley and stand (http://www.thingiverse.com/thing:155018). It attaches to the stepper motor bottom, aligning with the top idler pulley for parallel strings. Designed in Sketchup, it requires about 0.8mm thick string, offering 3 turns and 8 revolutions for full height movement with minimal deflection. Discussing whether to include spokes for material savings, I redrew the pulley in OpenSCAD using Karl Maximilian's Metric Screw Thread Library (http://www.thingiverse.com/thing:31363). Realizing not all Nema 17 stepper motors have flat sides on their shafts, I added a version with round shaft hole and three holding screws at 120-degree intervals. A scad file allows toggling FlatShaft and holding screw holes, experimenting with polyholes for potential improvements. Gineer R&D contributed to the design.
With this file you will be able to print Nema 17 Stepper 25mm driver pulley with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Nema 17 Stepper 25mm driver pulley.