Simple wall hook with hole marker. Just push in the top of the guide to set it in the sheetrock, then use a level to get it just right, then push in the bottom part to make the holes you need to drill for your wall anchors.

Unsure of actual weight it can hold, but I pulled on it pretty hard and it didn't budge at all. Assuming you have your printer printing right, and using a decent filament, you should be able to hang pretty much whatever on these.