Thanks James, I've been playing a little with FreeCAD. Just an idea, for any of the CAD and printing corps. The Poseidon xStream has two tabs for bungee attachment, thought they are still rather close to the mouthpiece. Seems like something like that, in semi stiff rubber or plastic, would be a good idea, and might support some type of breakaway. It has snaps for a necklace which attaches an inch or so to the side of the mouthpiece body. This works, but reduces the adjustment range and does not easily support ripping the reg out of the bungee.Ī vintage regulator I have came with a stiff oval leather piece that fits around the metal mouthpiece before the rubber part is added. Tying the bungee to say the adjustment knob shaft and the hose coupling spreads the bungee apart and seems to eliminate any tangle between the mouthpiece wing tabs and the bungee. Tying the necklace bungee around the mouth piece seems to contribute to one side or the other of the bungee being across the mouthpiece when I go to clear it.

My suggestion for 3D printing is a regulator attachment point for the bungee necklace.

Freecad 3mf