Magnetic egg crate ceiling vent for 150mm square duct

My apartment has 3 ceiling vents with 150mm square ducts that were impossible to clean. I came up with this two piece design; the frame is friction fit, but could easily be attached more permanently. The frame makes use of the full 180mm square bed available on the Prusa Mini. Requires four 10mm x 2mm cylindrical magnets, which are readily available, which I glued in with cyanoacrylate.