Slug Trap with a threaded lid
I had printed out this slug trap and it works great but the lid kept getting knocked off. This one is based off of that but I built it from scratch.
Instructions:
Fill with beer, screw on lid and place in your garden.
Slugs are attracted to beer so much that they'll drown in it. Bye bye slugs! Well really they're attracted to the yeast in the beer so you could use a yeast mix.
Since this will be used outside, if printed in PLA, heat and sunlight will quickly deform it. I strongly suggest you print with PETG or better.