Carbon Fiber FR is a flame-retardant, ultra-high-strength variant of Markforged's Continuous Carbon Fiber, available in the aerospace-ready "-A" version, which comes with lot-level material traceability documentation and meets the qualification requirements for 14 CFR 25.853 for most 3D-printable parts.
Compatible with:
Carbon Fiber FR-A is only compatible with Onyx FR-A