Brand: Unbranded Due to Creality batches, the original motor shaft of the Ender 3 PRO printer may not fit perfectly with our dual gear. After proper installation, even if the gear on the motor shaft appears to be slightly higher than the motor shaft, it will not come loose after being. Of course, you can replace the full-size 42mm high stepper motor if the original motor shaft is too short to install the gear. UPDATE: Perfect replacement for Creality 3D printers, e.g. for models 2, 2, 2, 2, 2, Pro, Ender 3, Tornado, etc. Aluminum alloy, high-quality dual gear extrusion, stable and durable. This kit does NOT include a stepper motor and instruction manual, we need to do it ourselves. Support: 1.75mm filament. Some customers have encountered problems with equipment wear. The solution is: I had to change the extruder steps from 100 to 139 Because the filament is forced to center in both grooves of the drive wheel, the idle drive wheel (the one not connected to the motor) is placed in its axis by the motor's impeller. To correctly center the pulley drive wheel, therefore, my suggestion for installing the unit is as follows: 1. Assemble everything, but do not lock the motor's drive wheel onto the shaft. 2. Use a pair of paper pieces and place the drive wheel in the center of the holder. 3. Hold a filament in the drive grooves and turn the motor a few turns. This should place the motor's drive wheel in the correct position. 4. Lock the motor's drive wheel onto the shaft, remove the paper washers and you are ready to go. Material: Aluminum alloy Color: Photo color Package content 1 * Dual gear extruder Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.