Summary

Wall mount for a sheet with a thickness of 3mm (i.e. plexiglass or acrylic).
No risk of cracking it when drilling holes as you can use the mount instead.

There are 2 mounts, one for the sides of the sheet (embossed "S") and one for the bottom (embossed "B").
Both are different as the bottom mounts has a little ridge to keep the sheet from moving while the side mounts are smooth the allow easy removal for cleaning, etc.

2x screws per holder, can't remember which size but they are one of the most common sizes

Print Settings

Rafts: 

No

Supports:                      

Doesn't Matter

Resolution: 

0.2 mm

Infill:                      

20 %
 

Notes: 

Side mounts can be printed the right way up but for the bottom mounts recommend printing them on their sides like in the 6th picture to keep the ridge as even as possible.