Three-way valve

thingiverse

This little project was a blast to work on, and it's probably more useful than I initially thought. Running three flexible silicon tubes through this setup allows me to choose which one is open at any given time using a servo, effectively clamping two out of three hoses. This clever design means I only need one pump for all three pots. The construction is cleverly self-locking without relying on screws, although I did use some screws to secure the servo in place. I opted for a standard servo equivalent to a Futaba S3003.