Round Box Outlet Cover

I'm replacing fourescent fixtures in my garage with 8 foot LED lights and I needed a cover for a 4 inch round box with an outlet to plug the LED fixtures into. Yes they can be bought but they are steel, $13 each (I needed 4), I have to order them, they're a week out and they look like crap against a finished ceiling.The cover is 4 ½" and I added a 3/8" flange to cover the holes cut around the boxes and the boxes themselves are never flush plus it adds a little extra room for the outlet. They're printed in PETG, I wouldn't reccomend using PLA. UPDATE: Added updated STLs, one with countersunk holes and one for a 2.75" box. These are untested because I have no need for them so feel free to let me know if any adjustments are nessesary.