cable hole cover / protection (threaded fixture)

The sideboard we bought from IKEA didn't have a hole for cables so I made one. To protect the backboard and the cables I made this simple cover that screws together from both sides and tightens around the hole.

The files are for a hole of 69mm and a backboard of thickness 2.7mm.

I included the .f3d file which has two parameters for the the values above. Should be easy to adapt other dimensions too.