My model of Robert/People planter, this one is called “Listener”.

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

For larger ones increase cup size to 110 mm / 4.33 inch.

Print profile file is medium size.

This model needs some minor supports. If you have some problem with bed adhesion - 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 or paint it at the back

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 :)

If you want 0 maintenance decoration, you can also use dried flowers.
For example you can add floral foam (it costs under 1 euro/dollar) to the head/pot for the base, put moss on top (or substitute with small pebbles) and stab dried rainbow gypsophila (or any other similar dry flower) in foam. It looks kinda cool and stays that way for a long time: