Hole Grommet (customisable)

A customisable hole grommet for cable pass throughs in shelves and desks and walls. created as I had a north american hole saw of 2 1/8 inches and only access to metric grommets. Decided to customise the design to enable it to be used flexibly. Lots of adjustment possible to make the perfect fit. There is an openscad file attached for use under the 'creative commons attribution share alike license' (unfortunately I can't make it work in the customizer here, but it does work perfectly in openscad).