These are picture frame tabs to hold the back board of the frame in place.

The top side surface of the tabs has a bevel around the screw hole so that the screw can sit flush with the surface and not scratch your wall. As such be sure the bed side of the print goes towards the picture frame.

Cura scaled and oriented for printing it is recommended that you use thermally calibrated filament for best results and fit.

I recommend using one of these clip sets for calibration.
https://www.thingiverse.com/thing:2502677
https://www.thingiverse.com/thing:1037301

ReliaBuild3D RB3

No

No

0.10 mm

24%