I noticed that after drying my filaments in the Eibos Cyclopes multi-filament dryer, the humidity begins to creep back up as moisture sneaked in through the open exhaust and filament holes. To prevent that, I designed exhaust and filament feed plugs.

What I call the “exhaust” is the center cutout pattern on the plexiglass cover

What I call the “filament feed” are the 10 grommet lined holes on the face and top of the plexiglass cover.

I printed this without any supports or brim on a Bambu Lab X1C with a 4mm nozzle and a layer height was 0.16mm. There's really no reason .2mm or greater layer height shouldn't work, but you may get “overhangs” on the chamfer if the layer height is too high.

Recommend to print in PETG, ABS, or some other filament with a higher deformation temperature. That being said, I printed in PLA and it's always worked fine for me.

Final note, you probably don't want the exhaust plug on when you're actually using the dryer as it's the primary vent for air swapping.