This is a remix of the Mushroom slug trap / Piège à limaces Champignon by xfifi at https://www.thingiverse.com/thing:2205074.

The three top supports went straight down into the bottom, letting the slugs climb out. I removed the three pillars and beveled the edges, making it easy to print without supports.

There was plenty of room in the design so I cut back the reservoir as well, making it a steeper reverse slope, thus even harder for the slug to climb out of.

I printed this at 0.175 resolution, 10% infill on both.

If you're using Cura, under Shell enable both Concentric Top/Bottom layer and Concentric Bottom Pattern Initial Layer. This helps it stay watertight, and is a must for pots.

4 walls, 5 top/bottom layers.

40 mm/s

No supports needed for the bottom, and 10% Line Touching Buildplate supports needed for the top (the slots).

Print Settings

Rafts:

No

Supports: 

Yes

Resolution:

0.175

Infill: 

Line 10%

Filament: AIO Robotics PLA Red, White