I have used many hexagonal flower pots designed by sgpdude (https://www.thingiverse.com/thing:4198158). My mother wanted a much bigger version that would hold a plant she got in a 6-inch (152 mm) nursery pot. I aimed to make a hexagon to contain an 80mm circle to give a little extra space. The height of 105mm is somewhat arbitrary, but fit her plant well. It has 7 small drain holes in it.

My first attempt at the water tray (base) was way too thin and doesn't hold enough water for my taste, but I have included it in case if works for you. The "thick tray" is much more usable in my opinion.

Printed with Creality CR10-S Pro V2 CR10-S Pro V2 Stock hot end .4mm coated nozzle 200°C Retraction Distance: 6mm Retraction: 6 mm @ 37 mm/s PrusaSlicer 2.4.1

~SDG