Hook accessory for the Bora P-Tops. It works with the stock P-Tops as well as my own versions linked below (and maybe others).
https://www.printables.com/model/1557411-bora-centipede-p-top-various-shapes-double-triple
I printed in ABS, 0.6mm Nozzle, 0.3mm LH. They look like they'll hold up well, though I expect that PLA and possibly PETG would eventually creep under the weight.
Print with supports for the notches, for sure. No other parts should need supports. I've printed without a brim but a brim would definitely not hurt. Alternatively, could lower the object into the build plate in your slicer by a few mm.
I was hesitant at first that these notches would be too fragile, and was already developing a more 3d printer friendly shape. After testing this out, however, I don't think these will experience any issues. I favored functionality with the standard P-Tops over an alternative design, in other words.
The author marked this model as their own original creation.