This was modified from RoyToreHofstad's creation.
I moved the top screw holes toward the center, because most wall studs in my area are only 1.5 inches wide, and finding the exact edges of a stud is not easy.
I also extended the tips of the arms slightly vertical, so as to deter the guitar from falling if twisted on the mount.
I printed this on a Monoprice Mini Delta using Hatchbox Wood PLA, 0.1mm layers at 200°C.
The model was printed with the wall-face against the printer bed (arms pointing up, so as to reduce the need for supports).
I did use supports, however I'm not sure if they were really needed at all. I chose 50% infill, which felt very difficult to bend or break.
Print time was around 8 hours.
There were quite a few extra strings to remove after the print (I still need to tweek the settings for wood).