Here is a modern planter with holes for water to drain. The exterior is designed with an organic spiral pattern, while the inside is designed with ease of potting in mind.
I printed the normal planter file with thick side walls and drain holes out of Overture rock white PLA. I used a 0.6 mm nozzle and 0.28 mm layer heights. This took about 10 hours on my Ender 3 printer, but could be reduced to about 2 hours by printing the solid model in vase mode (although you lose the drain holes and the thick walls).
The author marked this model as their own original creation. Imported from Thingiverse.