Resistance for a test lung

thingiverse

I followed the guidelines in this article: https://medium.com/@RobertLeeRead/how-to-make-your-own-accurate-test-lungs-for-testing-emergency-ventilators-2d68fe5ac460. The adapter allows for easy resistance testing by swapping out different disks. Printing the adapter with its smaller side facing down eliminates the need for supports during printing. Although the design is not yet flawless, the disks lack sufficient traction on their sides to be easily exchanged.