Features: brand new and high quality Lower noise, strong torque, stable property and high accuracy. 3D Printer motors 42-40 stepper motor 2 Phase 1A 1.8°士5% degree step angle stepping motor for 3D printer extruder. Compatiable with for Prusa i3 MK3S/MK3S+, BLV MGN Cube and /Switchwire 3D printers. Had better install it to BMG style extruder, which has >1:3 ratio. Motor Size is approx 42 X 42mm (1.7 X1.7In), come with 2M/6.56ft extension cable. Specifications: Step angle：1.8°士5% . Number of phase：2 Phase voltage：3.5 VDC Phase current：1.0Amp. Phase inductance：4.5土20% Static moment：0.13 N.n Insulation class：Class B Insulation resistance 100MO min. (500V for DC) Ambient temperature：-20°→+50° Ambient hum：15% to 95% Motor weight：Appror 0. 1Kg Use vol tage ：VDC: 12-36V Recomnended drive：0K2D4020A Cable:40cm/1.31ft Extension Cable:200cm/6.56ft Compatiable with: for Prusa i3 MK3S/MK3S+, BLV MGN Cube and /Switchwire 3d printer. Package Includes: 1Set For Extruder Motor note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.