Applicable models and design - This nozzle hot end kit for A1 and A1 Mini 3D printers features an improved threaded nozzle structure with detachable, replaceable nozzles. Easy replacement - Updated design from the original. The standard A1 hot end head has no replaceable nozzles, while the Xirbbo A1 Extrusion Head uses threaded, hardened steel nozzles that can be removed and replaced to lower running costs. Premium materials - Heating block made of Ni-plated brass Ti alloy for durable heat resistance, wear resistance, erosion resistance, and long service life. High temperature capability - Hardened steel nozzle provides strong mechanical properties, higher thermal conductivity, and better oxidation resistance for extended life. Supports high temperature filament up to 320 C. The detachable nozzle can be quickly replaced to save time. Use scenarios and applications - Upgrade an A1 or A1 Mini to print high temperature filaments such as PC, nylon, ABS, or PETG up to 320 C. - Conduct frequent material changes in schools, workshops, or production environments with fast, tool-free nozzle swaps. - Extend nozzle life and reduce running costs by using replaceable hardened steel nozzles, suitable for ongoing maintenance and upgrades of the hot end.