I was using https://www.printables.com/model/81104-filament-spool-wall-mount-single-and-dual-rod-vers and one of my drywall anchor anchored badly. Having nothing to hold it together and not wanting to reposition that piece, I designed this bracket that goes right over one of the screw holes in the original piece and provides two new screw holes to ensure that your piece stay solidly to the wall.

The screw holes are quite large as I was using anchor screws to hold that part, which have really large thread. You can modify it to have smaller holes if needed.

I propose to use the exact same setting as the filament spool wall mount to get a clean effect.

Printed on a Bambu P1S

Grey Tough PLA from Polymaker
4 walls
25% Gyroid infill
0.20mm 

Model designed with Shapr3D