Not a new idea but a new design!

Another self-watering planter - if you want to know how I made it or want to make your own/make any modifications to the existing design, check out my instructable which includes links to my tinkercad project as well as details on how to make and use it.

https://www.instructables.com/Design-Your-Own-3D-Printable-Self-Watering-Planter/

There are 3 files - the insert, the planter and the water level indicator

The indicator should be printed with no infill or in vase mode so it floats - when the indicator is level with the top of the pot, the water needs refilling.