Here's my re-design of my previous design inspired by Benjamins “A1 mini PTFE tube clip” 

…which I again slightly improved ^^

Main features:

• Overall shorter design.
• Side-clips have been shortened and flattened to better fit the grooves.
• A latch has been added to make unplugging easier. 
• All threads have been redesigned to make them easily printable. 

Now all sizes available: 

• PC4-M6 (metric)
• PC4-M10 (metric)
• PC04-01 (BSPT - British Standard Pipe Taper aprox. 9.7mm)

Edit 24.06.24: Just added a metric version, improved and re-uploaded all files to made everything a little nicer and easier to differentiate.

That's also the reason why previous rated profiles say, they're are no longer available.