30mm profile insertion nut for M4 screw

thingiverse

Attach accessories to a 30mm printer profile without disassembling it by using an M4 screw and nut as the largest that can fit through the hole. Slicing at 0.4mm layer height failed, but 0.25mm worked smoothly. To fit the M4 nut into the prepared hole, apply heat from a soldering iron. Insert the entire assembly into the profile, rotate the nut clockwise to secure it in place, and tighten the screw for stability.