This model is a  snail collar / slug barrier that can adapt to any size necessary for your plants. Jus print the 4 corners and then you can print as many walls as you need to reach the correct size for you garden.

I also design a canal or dip at the top to put some coffee grounds to give an extra stop to any snail / slug that manage to clim the collar.

I added some small separate connectors for the different walls. 

I test the model with PETG HF and all the tolerances for the connector works perfect. Probably would works good with ABS too.

Glue is not needed ( YES if you wanna use PLA) but recommended.