This is an adapter to allow you to hang you brick creations with (brick 67139) on your walls without having to damage your walls. Perfect if you are in an apartment or dorm room and want to display your brick creations.

In testing I have found that PLA works perfectly fine, and the model can printed, with as little as 5% density and 2 perimeters. For an added sense of security, you can add a modifier the print to have the keyhole print with 3 perimeters.