oxygen cannula connection fitting
thingiverse
This is a fitting designed to keep wide opening oxygen cannula connected to oxygen hose with small oxygen tubing connector. When walking around the house with these two types of hoses connected, it can easily be pulled out when catching on a corner or just through friction. This fitting will help prevent that. It has been used for a few years now and it works great. Print a few of them because they tend to break eventually from being stepped on. I've had success with both PLA and PETG. 30% infill or higher if you like.
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