Sharps Container Cap

This is a one-way cap to turn a plastic jug into a sharps disposal container. It should print as a very tight fit so that it can't accidentally come off. https://youtu.be/Ft69Vr01XPU

Feel free to resize it for your needs.The inner 'ring' is 38mm diameter (19mm radius).

Rather than remixing, you can scale your X and Y axes in your slicer. Scale so that the proportion is based on 38mm and goes to slightly (0.1 to 0.3 mm) larger than the opening you're going to put it into.

Don't scale the Z axis.