This is a fixture for Sakura.io LTE module. (https://sakura.io/product/)
Using hole of breakout board, this keeps the antenna at the proper spacing (10cm).
The hex bolt on the back is retained so you can only tighten nut from above.
Check it out and let me know what you think.
material : 3D Solutech PLA
nozzle diameter : 0.3mm