For our larger outdoor plant pots, I designed a pot coaster with an inner diameter of 20 cm and a height of 2 cm. There are four wider elevations on the inside so that the excess water can drain out of the pots easily in heavy rain, as most of our pots have a lower base.

As the pot coasters are outdoors and are sometimes exposed to direct sunlight, I printed them with PETG. In any case, it is more stable than most of the stuff from the DIY store that ends up in the bin after one season ;-)

Maybe someone can use the pot coaster just as well…