With this pot and the plate you will have an ideal place for your plants.
At the bottom I added a small hole where the water could flow though if you gave too much. This is ideal for my Lithops which don't need so much water. There are coming from Africa and there the rain very rare.. From autumn to spring you shouldn't them water at all. From spring to autumn I am giving them 4-6 times water in 6 month.
You don't need supports and not a lot of infill. I used 15%. It depends on your taste which layer height you are using. I used a 0.5mm nozzle with a layer height of 0.3mm.