Uses a M3 insert from the base files of the HSW. I only had short M3 bolts, so the back side is thicker, with a counterbore for the M3 bolt head.
Printed at 0.2mm layer height, 20% infill. Vary as you need.
Print the model standing up with the M3 insert, grab an M3 nut and bolt, and mount your Cardo.
If you have any suggestions on how to make it better or if you want a different model comms device, we can work together to make it happen. STEP file also included so you can play with it.
The author remixed this model.