Wrench with nut holder:

I have made this wrench that holds the nut in place. It is useful for screwing in places, where you cant use your fingers.
The sizes M4 and M5 are the ones I use the most in my work.

They resist a little torque, but I don't recommend it for tightening. Over-torquing will deform the head, but you can still use it.
In the pictures they are printed with my worst filament and they work fine. You shouldnt have any problems with Printing.

I have a good experience with Pla+ and Petg. Maybe Pla works good too but the max Torque will be lower.

Happy printing! <3