This model is a small perfume diffuser for facemasks.
It is meant to put a tissue of cotton in the space inside the diffuser with a few drops of perfume. The perfume will then slowly diffuse for a few hours.
It uses to magnets to easily attach to the mask. I designed it for round 12mm magnets but you can use any smaller magnet if you glue it.
The two parts fit together tightly and are designed with a 0.2mm clearance. You may need to tweak the cover scale if your printer is over extruding.
The base part requires support because of the magnet cavity. You should use 0.4mm first layer for the cover for the mesh to print well.