For use with M3 double nuts used as fasteners.

I use it for the spring-loaded bed-leveling double-nuts on my prusa mendel 3d printer

You can tighten/loosen one or two nuts at a time. Usually in such fasteners, one nut sets the tension and the second nut is used as a lock nut.

Tags: accessory bed finger level M3 mendel nut printer prusa rosette thumb thumbwheel wheel

There are a bunch of these out there, but I couldn't find one that dealt with double nuts. You only need one of these instead of 4 used in other designs where the nut is fused into the thumbwheel.

The .scad file is also attached so you can make changes to work with other types of hardware and/or improve this design as you see fit!

Enjoy!