- Compatible with A1 and A1 Mini 3D printers. This nozzle hot end kit features an improved thread nozzle structure with removable and replaceable nozzles for easy maintenance. - Easy to replace: An improved version over the original A1. The Xirbbo A1 extrusion head uses hardened steel threaded nozzles that can be removed and replaced to reduce downtime and operating costs. The A1 hot-end extrusion head supports special interchangeable nozzles. - Durable materials: Heating block made of nickel-plated brass and Ti alloy provides excellent heat resistance, abrasion resistance, erosion resistance and a long service life. - High temperature capability: The tempered steel nozzle is hardened steel with high thermal conductivity, strong mechanical properties and oxidation resistance for long life. Supports high temperature filaments up to 320 C. Removable nozzle is easy to replace and saves time. - Practical scenarios: Upgrade A1 or A1 Mini printers to handle different materials with quick nozzle swaps; run production or prototyping that requires switching between materials such as ABS, PC and nylon blends; perform frequent maintenance or optimizations with minimal downtime.