A simple but very sturdy wall mount for a FS91 and FS31 trimmer. It may fit other models as well with the same injection molded part around the upper driveshaft. I modeled this around my specific machine and you may need to scale it up to make yours fit properly. I highly suggest printing a test part with 10% infill to check the fit before you print with the settings below. Mount it with 3" to 3.5" #8 construction screws.  Make sure you get the screws in a stud.

I have made a change to the part in the pictures. The hole for accessing the head of the upper screw was too small for a bit holder to pass through. I added more clearance so its easier to get the upper screw driven in.

Standard prusaslicer settings for a mini and prusament PETG with the following changes:

20% infill and 4 perimeters.

I think this would be a great part to print with a larger nozzle to cut down on the time, I just didn't feel like changing it out.