Pot drainage meshes

I thought of creating these grids for the drainage holes of the pots because, growing a number of bonsais and pre-bonsais, I often find myself having to use many different meshes which are not always the right size, are often square to cover a round hole and almost always do not have spacers to allow the water at the bottom of the pot to drain properly.
The model is solid so to get the round frame with the grid in the center you have to play around a bit with the slicer settings: a sufficient amount of perimeters, completely remove upper and lower solid layers and the right percentage of infill to retain the soil in the pot but to also allow water to flow easily.
Another setting I recommend changing is the extrusion width of the infill in order to strengthen the grid. Choose a "Grid" infill and set its density to suit your needs
For a situation like mine (grainy soils from 4mm upwards) I am printing PETG with 

• 0.6 nozzle and 0.4 layer height
• 0 upper layers
• 0 lower layers
• 4 perimeters for the bigger ones and 3 for the small one
• Infill type Grid
• Infill density 45% 
• Infill extrusion width 1mm
• 5mm infill anchor length

At the moment I have uploaded 3 different sizes but if you need a missing measurement please write me a comment and I will try to provide it as soon as possible.