rockwool cube seedstarter holder

A holder for rockwool cube seed starters.The holder can split into two parts that are secured by a slip on ring.This enables the extraction of the grownup seedling without damaging the roots.On the second plate are covers that fit plastic boxes and have holes in them to fit the holders nicely. The rockwool cubes swell up and get stuck when the plants grow (roots take up space). So by making the holder come apart, extraction can happen with minimal root damage. recommend do print in black, so it blocks the most light from entering the container (anti algea).