I needed a wall mount for my hammers. Looked around online (for like 5 minutes and got bored) and everything either had unnecessary features that added print time, or was designed inefficiently for strength / layer orientation. This model slices at a faster print time and less filament than the few alternatives I thought of before I gave up and made this. 

Print as you would mount it on the wall. 

1.8mm wall thickness and 1mm top and bottom thickness in PETG lets me literally drop a 10lb sledgehammer on the bracket from 2' and it has not cracked yet. YMMV

File name refers to the clear opening between mounting prongs. I hate when scaling mounting holes and turning them into ovals, so I gave you two options. If you need it longer, scale it as you wish in your slicer.