Have anyone wondered how expensive it will be for JH Audio if people who opt for the carbon fiber repeatedly sent back their roxanne for refit? If it's too loose, I'm sure JH can just add another layer of acrylic/resin on it but if it's too tight, does that mean JH have to replace the entire housing? Not sure how refitting works though so my assumptions may be wrong.
That's a really good point.
In terms of refitting a CIEM that is too tight, I wonder if it might be viable to grind almost a millimetre off the surface of the entire CIEM (except the faceplate), then make a fresh investment casting of the customers new ear impression, then partially fill that investment with acrylic, and insert the ground-down CIEM into the investment, so that the liquid acrylic bathes it but the end result fits the new ear impression exactly. (Obviously, one would need to seal the CIEM nozzle first).
I think that might be a viable solution.