One of my previous designs is for a cable catcher to stop cable from falling off the end of desks but what if people want an alternative? cutting holes in desks/work tables is easy enough but what you really want is something that will look nice too.
So I've designed a desk grommet like you get on most office furniture.
It slips into a 6cm hole and lets you run your power and other cables through it neatly.
This design is untested
2 STLs, 1 for the main grommet and 1 for the cap.
SKP files included in case anyone want to improve/customize.