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I used a Tower Pro MG90S servo, which is weaker than the one recommended. It pinches the tube shut, but keeps buzzing in the closed position. I suppose that's an indication that the servo lacks power.
The 3D-design is very good. Highly recommended.
Thanks for the awesome feedback. I 'd suggest to use the valve in a "normally open" configuration. By saying that I mean in a configuration that requires the less amount of time needed for the valve to be closed. That way i guess you could minimize the possibility of a servo overheating situation.