These SMA connector dust caps are designed to be printed with TPU. They're a snug fit and can be pressed on or twisted on.
My similar item, SMA Connector Dust Caps, is threaded and meant to be printed with PETG or similar hard material, but I've found over time that the threads are so fine they're difficult to use. I like these flexy ones much better and I suspect you may too.
Please note the license which requires derivatives to use the same license as the original, and it's my desire that you not exchange prints of these items for money.
Happy making!
The author marked this model as their own original creation.