This keyhole slot insert allows you to add a keyhole slot to any model you want to hang with a screw or nail.

It accommodates #8-#10 (1") or #10- #12 (1-1/4") screws.

Simply add the keyhole insert negative to your model as a negative part in your slicer. This will create the cavity in which you press in the keyhole insert. It is a nice snug fit. The insert and the negative are in 2 separate files. You have to download the STL/CAD files for the negative, so it can be imported independently.
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Supports
None needed!
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Scaling
I wouldn't recommend scaling these since they have a very nice press in tolerance.
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Orientation
Everything prints upright with its flat side on the build plate
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Print Settings
.2mm layer height
15% grid infill
2 walls
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Hardware
Wall Anchors with Screws