Size guide:

MINI: very small pots ideal for single leafs and cuttings
XL: big pots for grown plants or bigger leafs
Note: MINI is just a 50 % downsized version of XL, so you can just transform them into                        each other or even create new sizes which fit your needs

Print guide:

Supports: no
Brim: maybe if warping is a problem, else no
Material: PLA (be carefull with heat); PETG; …
 

Post processing:

• use clear coat (DE: Klarlack) to make the pots watertight and more resistant

Happy planting!
Make shure to share your results as a make!