Summary

This Tesla valve is designed to be printed with an open top, and then you can glue a piece of clear acrylic/plexiglass to the top so that the inside can be seen in action.

Sadly, it doesn't work very well. It restricts the flow in the reverse direction to some extent, but not well enough for any kind of reliable application. I have attached the vector file that I used to create the flow path, if anyone would like to tinker and get it to work more effectively, please do!

The inlet and outlet are designed to fit 4mm IV tubing that came with some syringes that I bought. I think it's a fairly standard size.