M3 double nut thumbwheel

thingiverse

This accessory is perfect for M3 double nuts on a Prusa Mendel 3D printer's spring-loaded bed-leveling system. With it, you can easily adjust tension by tightening or loosening one or two nuts at once. Typically, one nut sets the tension while the other acts as a lock nut. This design features a single nut instead of the four found in others, where the nut is fused into the thumbwheel. The included .scad file allows for customization and improvements to fit various hardware types. Have fun!