My dad was having trouble when dirt and other particles were getting in his CPAP so I made a cap he could put over the top when he is not using it. The only real challenge was making sure the cap's thickness was right and it would fit over the entrance.
Making sure the cylinder is the right size is relatively easy, but making sure the walls were the right thickness was a bit trickier, rounding up makes sure that it will fit, while not being a perfect fit, it is close enough that no large particles of dust will get in. Other than that, making sure the cap was printed upside down saved me a lot of work and the possibility of having to reprint.
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