1. Applicable model: This nozzle hot end kit features an improved threaded nozzle structure, which is removable and replaceable separately. Compatible with A1 or A1 mini 3D printers. 2. Easy to : This is an upgraded version improved over the original. The stock A1 hot end does not support interchangeable nozzles. The Xirbbo A1 hot end features hardened steel threaded nozzles that can be detached and replaced, reducing operating costs. This A1 hot end allows for the use of specialized interchangeable nozzles. 3. materials: The heating block is crafted from nickelplated brass and titanium alloy, offering heat resistance, wear resistance, corrosion resistance, and extended durability. 4. temperature printing: The tempered steel nozzle is made of quality hardened steel, providing thermal conductivity, enhanced strength, oxidation resistance, and a longer lifespan. It supports temperature filaments up to ≤320°C. The removable nozzle design ensures quick replacement and saves time.