I was building this belt sander and wanted to run the power cord and extra ground wire through the plate but really did not have a good insulator that would fit.
So why not print one up to fit my specific need?
Simple print and sizes are easy to change, etc. Picture sizes are in MM.

This "Thing" is really more to present the idea to others than something to build, unless you happen to have the same size I used. I think in CURA if one increased or decreased the % size some variation in sizes could easily be achieved.

Suppose I should add this does involve Electricity, so check with local codes, the power you may be using, .... and anything else that could cause harm.