Wanted a simple Plant Pot with a water reservoir.

Designed something and tried it.

For not wasting filament on supports I cut the insert in 5 parts. Just glued them together and it is holding up for now :D

For the pot itself you should make it so that there is no infill but solid perimeters. That should help to make it watertight.

I used PLA for everything but if you plan to put it outside in the sun i would suggest to use PETG especially for the insert because it is really thin!