I had a cardo freecom x4 comms system, and bought a new helmet Nexx Wed3.

The helmet nexx has a nice slot for their proprietary comms system, and I used the slot to build an adapter so it can hold my cardo.

It looks like delicate piece, but i've ridden with it for months without any breakage while riding.

It's a clean integration, and the comms stay in an accessible position.

Plus, the cables are kept hidden in the little cavity inside the adapter, for a clean set up.

I printed it in PETG