This door latch and handle is made to fit a 4mm plexiglass sheet, just cut out a 22x15mm slot on the edge of the sheet and slide in the handle. Add a small amount of glue to hold it in place if necessary. Thread a piece of filament through the holes to hold the lever in place. Mount the strike with double-sided tape or use screws.

Everything prints without support. To make a nicer bridge, the upper hole (when printing the piece lays sideways) for the lever pin in the handle part does not go through the first bridging layer above the slot so it has to be opened with some fitting metal pin.

This is part of my take on the 'IKEA Lack printer enclosure' thing.