This is a flower (or plant) pot I designed. It has a marking line in case you want to fill the bottom with sand or gravel. Also there is a water level indicator. You can just leave it bare and see the water inside, or you could put a little plastic ball in there to highlight the water level.

For the print I used 105% material flow to ensure the pot won't be leaking anywhere. (The first print had 100% and leaked slowly.)

As a final thought though - I found that the inlet for the water level indicator may clog after some time. So maybe in the future I'll have to make a redesign with a larger inlet hole…