I got this idea from a print on Thingiverse but it was a plug insert that was intended to be printed with flex. I opted instead to turn it into a nut and bolt and use PLA. Link to the original idea here.
I exclusively use either an external multiprotocol or Crossfire module on my X9 Lite so I decided to delete the stock 2.4gHz antenna. I cut mine to remove it because I didn't feel like soldering and either way would have to solder one back on if I ever wanted it.
I opted to trim the small protrusion off the case for a flush look, but this bolt is long enough to work either way if you don't want to go that route.
If you use the .stl to print, print the bolt at 10% scale and the nut at 11% scale.
I used sparkle black Hatchbox PLA.
The author hasn't provided the model origin yet.