Desk Hole Insert (Screw secure, bottom pocket)

So my desk came with these 80mm holes drilled in it for running cables. Except one is totally unused and my kid keeps popping it out and throwing it around the house! So I built one that screws on at the bottom and provides a nice little pocked to boot.

The threads of this worked for me at a .3mm resolution. Infill/walls at whatever makes 'ya happy. Flip the screw cap over so you don't need any support material. My desk is about 25mm thick, but the threads go a bit deeper so this might work for slight variations of depth; caveat emptor.