One way valve with a flap.
by mymakerblog, published
Update:I printed this with nylon and the flap worked much better, blocking 80-90% of the fluid flow in the reverse direction!
Prints in one piece one way valve. Works, but not steller.
Blow in the reverse direction and the flap closes. Blow in the forward direction and the flap opens.
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Print all in one piece. No support material needed.