Paintball HPA Tank Fill Nipple Cover
thingiverse
This is similar to the 8mm fill nipple cover except that it uses 5mmx3mm magnets, which is what I had on hand, and why I made it. These work nicely in PETG if you upsize by 1%. I'm going to print a few in TPU at 100% or maybe 99% to see if they hold nicely without using a magnet. I just added the V2 to include a retaining lanyard. Print this one in TPU only. If it doesn't fit snug, try it at 99 or 98 percent until you like how the friction holds it on the fill nipple.
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