UPDATE: V2 is here: https://www.thingiverse.com/thing:3445849
Redesigned the lock so that it prints with no supports and lays flat on a table.
LOVE the original design, but needed a way for it to stay shut when closed. Added a little clip to lock the lid down that doesn't hamper the easy opening and closing ability. Unfortunately, that means the lid piece requires supports. I've included the original version without the lock and my version with the lock.
Read the notes from the original design for assembly instructions, but I would add that a little drop of super glue on the "filament nails" before they go into the holes helps out. Despite the original designer's instructions, I had to apply super glue to the peg on the lid that goes into the lever to get it to stay in place.
Use honeycomb infill pattern.