I have the unfortunate habit of over-watering my plants, meaning the water sometimes spills from the normal drip tray on to whatever surface the pot is on. This is a lot of pain to clean up, since you have to move the pot and dry everything. Furthermore, with rough ceramic pots, you can sometimes scratch the surface underneath when moving the pot. 

Putting a bit of cardboard underneath helps to catch the spillage. However, the wet cardboard takes a long time to dry when compressed between the pot and whatever surface it's on.

This model is a simple tray that you can put under your pot to (a) catch any overflow (ideally put some cardboard into the tray as well) and (b) prevent the pot from scratching the surface when moved (so you can easily push the pot aside to clean up the spill).

The tray is raised slightly, meaning if it ever gets wet, it can dry pretty easily (it is not just “sandwiched” between the pot and the surface it's on). And if you need to move/slide the pot, it also glides pretty well on most surfaces without scratching.

WARNING: The tray itself is not water tight. Put some cardboard in it to soak up minor spillage.

It comes in 3 sizes: 14cm, 17.5cm and 21cm. 

Printing notes: 

• Fuzzy skin makes it look a bit more organic.
• You can get away with almost no infill (5%) and very few perimeters (2 layer side walls, 3 layer top/bottom). The pyramid structure at the bottom is plenty strong.
• However, you'll most likely need a brim for the first layer.
• Use adaptive layer height to make the top beveled edges look nicer (also speeds up the print as the lower layers that don't need as much detail can be higher).
• The larger models will probably bend quite a bit, since it is essentially a single large rectangle. Slow down the print, or add an enclosure if needed. However, most bending should not affect the function of the print, just aesthetics. 
• Some recommended printing profiles are included on top of “basic” STLs.