1. Applicable model: This nozzle hot end kit features an improved threaded nozzle design, allowing for separate removal and replacement. Compatible with A1 or A1 mini 3D printers. 2. Easy replacement: 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 operational costs. It enables the use of specialized interchangeable nozzles. 3. materials: The heating block, crafted from nickelplated brass and titanium alloy, offers 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, and the removable nozzle design ensures quick replacement and time savings.