Rooting ball: Fill with moist sphagnum moss, or similar rooting medium, and tie around a plant branch where you want to make a new cutting. After a while, typically a couple of months, roots should grow within the ball from the plant branch.
This will help you grow a cutting that is ready to plant with its own root system.
Tested with PETG for flexibility. If the hinge breaks just twist tie it back together (that's what those holes are for).
The author marked this model as their own original creation. Imported from Thingiverse.