Cable Grommet for Desk or Dry-lining (parametric)

Having mounted my LED television on the wall I have a 80mm hole behind the TV, through which all the cables arrive. No-one can see it of course, but I know it's there and it needs finishing, otherwise I might start muttering incoherently.

It was designed in openscad and is fully parametric, it could doubtless be used for other purposes, including a desk grommet.

Features
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* Fully parametric (see instructions for source files)
* Adjustable to fit any hole
* Paramet