CPAP mask ozone cleaner fittings for freezer bag or food storage box
Description
These are fittings to allow the ubiquitous Chinese ozone generators to disinfect the mask as well as the hose and machine. Cut holes in a freezer bag or cheap food container (gladware or similar) and mount the adapters with one nut inside and one nut outside the bag/container. The biggest change from the source thing is that the "female nut" part allows you to connect the mask to the ozone generator inside the bag/box. I also reworked the threads: I designed them with lots of clearance so they will still work if the 60 deg. overhangs don't print cleanly. Basically it is a 2.5mm thread form spaced to a 5mm pitch. Finally, I made individual male and female parts rather than relying on scaling to make one part serve double duty...a clever idea, but my way allows all the nuts to be interchangeable. Print 3 of the basic nut parts, (just one of the female nut) and one each of the other parts in the orientation shown in the slicer screen capture. There is a slight taper (0.8 deg/side) to the slip couplings, but the dimensions for the female parts are still fairly critical as most filaments will not have the flex that the rubbery hose ends do. I recommend a test print of the female adapter part, stop at about Z=20mm, and see how it fits. Then scale up or down (probably less than 1%) and try another test if needed. Once you have a good fit print all parts with the same scale factor so the threads all work. The inner dimension of the female nut part is the same as the female adapter, so it should fit the mask at the same scale, once you get the female part fitting on the ozone generator. Be sure to trim/sand/file away any elephant's foot at the end of the adapters before test fitting.
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