Features 1、Designed for Prusa: This dual Z axle upgrade kit is specially designed for Prusa i3 MK3, for MK3S, ideal for replacement, and there's no need to modify firmwares. 2、High Torsion Motor: This 3D printer dual Z upgrade kit comes with for nema 17 Z high torsion stepper motor with integrated 320mm/12.59inch Tr8x8 screw rod and 250mm/550mm cable length. 3、High Stability: This dual Z axle kit reduces the layer ripple caused by Z axle impact, avoiding backlog of filament thoroughly, which improves stability of 3D printing and increases the printing performance of 3D printer. 4、Stepper Motor: This 3D printer screw rod kit comes with stepper motor that ensures screw rod smoothing operation. Efficient and reliable with high speed and low noise, making leveling easier. 5、Durable Material: These 3D printer upgrade parts, including dual z axle and stepper motor, are made of strong and durable metal material in high strength. Specification Item Type: Dual Z Axle Upgrade Kit Material: Metal Screw Rod: Tr8x8 Screw Rod Screw Pitch: Approx. 2mm / 0.08in ( Manual Measurement, Slight Error May Exist ) Screw Rod Helical Pitch: Approx. 8mm / 0.31in ( Manual Measurement, Slight Error May Exist ) Cable Length: Approx. 250mm / 9.84in, 550mm / 21.65in ( Manual Measurement, Slight Error May Exist ) Motor Size: Approx. 42 x 34mm / 1.65 x 1.34in ( Manual Measurement, Slight Error May Exist ) Applicable Model: Designed for Prusa i3 MK3, for MK3S Package List 2 x Dual Z Axle Upgrade Kit