This is my first attempt at creating something. I just needed a float for the large self watering pot. https://www.thingiverse.com/thing:4517471 by kdrummer

Printed it in vase mode 0 top 0 bottom .28 layer height 0.4 first layer. 1 perimeter.
I packed the bottom with some old Styrofoam because i don't trust such a thin print being water tight then i sealed it with hotglue. I wanted it nice and light.

I used some silver nail polish for a max fill line based on where the water level was that i wanted.