Ender 3 Pro bed level wrench / thumbwheel

thingiverse

This is the absolute minimum factor I could come up with while still being incredibly easy to use. You can utilize it as a versatile tool - just swap out the standard bed level knobs with M4 nuts, slide this wrench over them and tighten it in place. Alternatively, you can glue the nuts directly onto this fixture and leave it installed given its compact size, ensuring it won't collide with the stepper motor (a common issue for those who, like me, have press-fit pulleys and had to print an adapter to install dampers).