My model of Robert/People planter - “Morning Cup”.

For medium sized plants choose medium sized version, cup size 80 mm / 3.15 inch.

For larger ones choose large size, cup size 110 mm / 4.33 inch.

This model needs supports, I found that tree supports work better. For better adhesion you can use Brim.

I like to print these planters with fuzzy skin turned on (contour, fuzzy skin distance - 0.3, fuzzy skin thickness - 0.1).

It can be printed smooth also, just be sure to check that seam is placed at Back/Rear.

When planting cactus or succulents at the bottom I add a little bit of pebbles for drainage and then potting soil.

And don't forget to water it according to your plant needs :)

You can find more models at my profile: