Summary

Small lock mechanism with handle. Use a M4 bolt at about 3cm length. Used a lock washer between handle and lock. Alternatively some glue can be used or just tighten enough and it should hold. Drill a 6mm hole in the plexi for the handle/lock part. Might need some widening depending on printer setup so if you have a 6,5mm thats ok. For the lock part 2 adjust so that tight fit between lock part 1 and 2.

Print with about 20% infill.