Features: Brand new and high quality The whole hot-melt section is enlarged, the length is as high as 28.5mm, and it supports 600mm/s high-speed printing. Upgraded the 300°C high-speed print head for the ceramic heating block brass/hardened steel nozzle for K1 hot end kit. Compatible filaments: ABS, PETG, PP, PC, nylon, etc. Stainless steel capillaries supporting high temperature printing (≤300C) has excellent thermal insulation performances, while copper has excellent thermal conductivity, which can accelerate heat conduction, so the overall performances is better. Large-scale hot-melt section and high-flow support 600mm/s high-speed printing. The whole hot-melt section is increased by 30% (the length of hot-melt section is 28.5mm), which supports 600mm/s high-speed printing. Specifications: Material:Plastic+Metal Type:Titanium Alloy/Copper Package Includes: 1 Set Ceramic Heating Block note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.