For my filament drybox, I wanted something sleek/hidden for mounting my Eva-Dry E333 dehumidifier. Unfortunately, there are no holes on the rear of the housing to mount it against the wall. I used some of the features (where the screws hold the front and rear covers together) to "hang" on this bracket. This allows me to easily remove it for when it needs to be recharged and can be mounted anywhere! The hole sizes are for 3 mm screws to mount to panel or wall. I would recommend a minimum of four perimeters for this print.