Spacer to put under flower pot to increase height. It contains holes to let the water through.
Height: 8.1mm
Diameter: 105mm
Water holes: 6 * 3mm
You can use the attached FreeCAD file to customize the model.
The model doesn't have a lot of contact surface with the bed. I recommend increasing number of walls until there is no more infill. This will make sure the printer is doing smooth moves and decrease the chances of the model detaching. It will also increase the model durability.
The author hasn't provided the model origin yet.