This is soil separator for any planter pot with a diameter of base smaller than 18cm. It supports growth of roots. I made two versions, one without a pipe (for plants which don't need a lot of water). I also made one with a short pipe near the center (for plants which need more water).
Print from PETG or any durable and flexible filament.
Put this printed soil separator in a planter. Arms around the center should be slightly bended upwards as can be seen in the first image. Then fill the rest of the planter with soil. If you print version with pipe you must fill the pipe with soil before you fill the entire planter pot. It helps water rise to roots.
The author marked this model as their own original creation.