I created my own peg because I wasn't satisfied with the designs I found in the internet. My design consists of two bodies with zero gap between them.
One .3mf file is saved as a project and contains all necessary settings. The other one contains just the plain object. If you load it, please right click on “Körper5” and choose “Add settings → Advanced → Infill/Perimeters overlap”. Now set the value from 15 to 16 Percent. This forces the slicer to handle the bodies as separate ones and both bodies get own perimeters as you can see in the pictures.
I put a crate of water bottles (14,3 kg) on the shelf as a test.
The author marked this model as their own original creation.