A simple envelope gauge designed to allow a DL envelope to pass through longways, to make sure that the thickness doesn't exceed 5mm.

I created this little model as if an envelope exceeds 5mm thickness with my local post, they charge an exorbitant amount more to post it.

Printed on FlashForge Adventurer 5M:

15% infill

0.2mm layer height on 0.4mm nozzle

10mm Brim