This is a simple hook that I designed to hang two of my laundry racks to the side of my storage rack when they aren't in use.
The hook can be mounted parallel to the side or the adapter can be used to mount it from the bottom.
To use the adapter you need two m2 screws and nuts.
I printed it 0.3 mm in PLA but it should also work fine in PETG.
The author hasn't provided the model origin yet.