We printed a few bicycles for a customer's branding using the carbon reinforced material by colorfabb. We printed the joints with that, used carbon oval tubes to join the joints and then used off the shelve bicycle parts for the rest.
Came out great once a lacquer finish was applied and some graphics.
As for strength, it's not comparable to real carbon fiber parts. It's more gimicky, but does provide some more strength.
PLA has no swelling or anything from moisture. I have tested it by leaving parts in water for DAYS, and it did NOTHING to the PLA.
There's a few threads in here where many of us experimented with and used Colorfabb's XT-CF20. I think others also used ProtoPasta's CF filament as well.
You'll also want a hardened nozzle or one of ruby nozzles soon available, because the filament is very abrasive.
Temps and bonding, I don't recall what worked best. But there is some threads in here that could help you find answers.
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