3D Printer Accessory - extruder upgrade kit, gear ratio 3.5 : 1 with a torque of up to 80 N, support for filaments with a diameter of 1.75 ± 0.05 mm, displacement to a maximum distance of 3 mm, adjustable filament pressure, printing up to 300 °C, all-metal design with 2 fans, compatible with Creality Ender-3 S1 and CR-10 Smart Pro, dimensions 54 × 50 × 64.3 mm