This is the first version of a guitar wall stand I've made.
UPDATE 1: I realized that it might need only a bit more distance to the wall for some guitars (specially acoustic guitars) so i added a base as a separate object so that it doesn't add to much pressure to the PLA by passing the screws through it. Its 20mm thick because i think that is the optimal distance from the guitar to the wall.
UPDATE 2: During this testing time i realized that the heat of the environment was slightly bending the holder, i decided to increase its diameter and i believe that with a 60-80% of tri-hexagon infill it should last for a lifetime.
DETAILS:
It uses 3 screws of 5mm in diameter and holds guitars that have a neck wider that 52mm.

You need supports and I recommend printing it with the top side oriented on the bed of the printer in order to favor the line resistances.

I don't recommend printing it with black filament nor leaving it on the sun because it will start deforming

Make me know if I need to make any changes!
I'm considering dividing it into two pieces in order to put a screw in the middle and make it stronger but it might be unnecessary.

Creality

Ender-3 Max

Yes

0.2 mm nozzle

20%

This is the first version of a guitar wall stand I've made.
It uses 3 screws of 5mm in diameter and holds guitars that have a neck wider that 52mm.

You need supports and I recommend printing it with the top side oriented on the bed of the printer in order to favor the line resistances.

I don't recommend printing it with black filament nor leaving it on the sun because it will start deforming

Make me know if I need to make any changes!
I'm considering dividing it into two pieces in order to put a screw in the middle and make it stronger but it might be unnecessary.