This is a wire pass through for 68mm standard holes that best clips onto 3-4mm MDF / HDF walls in the back of shelfs, but should fit into thicker material as well.
It does not require supports and is best printed in PETG. I also uploaded the FreeCAD files so you could modify the part if you need to.
The author marked this model as their own original creation. Imported from Thingiverse.