Eggfinder Mini TX GPS Transmitter tether mount - TX and LiPo

I created this tether mount after a high-impulse flight destroyed one of my Mini TXes at liftoff by inertially pulling the board off the Kevlar tether I had looped through the PCB holes.

Clearly, that was not the way to fly and I needed something more robust. I initially made a very protective FDM case, but it was large enough to give me pause about flying it in my fiberglass BT-60 rockets - so it rarely flew. This case is the result of slimming that project far down, and creating a minimally-protective tether mount (with a stronger attachment point).

I recommend printing this on its side so the weak Z-axis traverses it horizontally when in the expected orientation at lift off. The side, vs. the front or back (TX or battery side, respectively) will take a ton of support, and a lot of time to print it all. Printing on the bottom might be what your slicer recommends, but if you print that way, the weak axis will take all the impulse and you might just pull it to pieces in flight.

I used PETG, and M3 heat-set threaded inserts, with 8mm button-head M3 cap screws, both with lock washers. You can use some blue threadlock if you're nervous about them backing out.

I use a 300mAh LiPo I got from Hobby King. The exact battery isn't there anymore, but the battery area of the mount is a little bigger/wider and should allow some alternate sizes and mfgrs. The battery is retained with a single 5in zip tie.

This battery is probably close enough.

https://hobbyking.com/en_us/turnigy-nano-tech-300mah-2s-70c-hr-technology.html

You can probably find a little larger (maybe 500mAh) that will fit - make sure it all measures and weighs out.

Model is the same, but I've added a couple pictures that show a Mini TX with an SMA board-edge mounted connector and a Smiley Antenna 915 MHz (900-930 MHz) antenna. It fits just great! Looking at the clearance, you could probably mount an SMA cable as well (could reach the flats on the nut to secure it).