The tube grows up from a supported platform. At the base of the platform is a reservoir of substrate, and connected to this reservoir are a network of roots which contain a supply of each variety of substrate – tints, textures etc.
Each ‘root’ is a flexible plastic tube with a peristalsis device attached to it, the peristalsis action squeezes substrate into the reservoir whenever it is required.
The print-head draws its material from the reservoir at the base of the tower. The materials are mixed in this reservoir.