This is a spacer/mount that i made in OpenSCAD.
I needed a way to mount my removable Wifi antenna to my Spektrum DX6i.
What's inside is the mini pig-tail cable shown on picture #4.
There is a hex shape inside to prevent the cable end to turn with the antenna so that it doesn't break the cable.
Print it SLOW and with jerk control or else the thin part inside might break.