This is a T wrench for a M5 nut/locknut. This is what I use to change the props on my miniquad but can also work for any M5 nut. More practical than the huge wrench I was using.20% honeycomb infill and 3 walls is enough I added a "loose fit" version if you want the nut to fall out the tool when you are done. The default version is tight enough to hold on to the nut by design.