The Bambu Lab A1 Hotend  with a 0.6mm hardened steel nozzle is designed for durability and versatility in 3D printing applications. Hardened steel nozzles are particularly beneficial when working with abrasive materials, such as those infused with carbon fiber or metallic particles, as they resist wear better than standard brass nozzles.

. For heavily abrasive filaments, opting for a larger nozzle size, such as 0.6mm, is advisable to ensure consistent performance and reduce maintenance needs.