For those that are curious about what for 2 offers over for 1, here's a short list of benefits: for 2 is a full redesign, moving to a 9:1 gear ratio and optimizing the design over for 1. No parts from for 1 are reused with for 2. Custom 9T stepper with a taller spur gear resulting in 20% higher contact area than existing 10T stepper designs, resulting in better wear characteristics and power transfer. Proper meshing of gears due to number of stepper teeth being divisible by number of planets (9T sun /3 planets), which gives even loading on the planets /sun gear and improves wear characteristics and power transfer. Previous designs with 10T steppers had uneven loading on the planet gears. G2 Extruder (G2E) is designed as a drop-in replacement for the CW2 extruder for printers utilizing the Stealthburner toolhead. G2E features a custom large drive gear (16mm diameter) mated to an idler bearing to help prevent extruder artificing due to gear meshing, and because it features a planetary , there's no issue with gear-meshing noise as found on CW2.G2E is also fully compatible with all current toolhead boards available. G2 Standalone (G2SA) is designed as an Orbiter 2.0 or Mini drop-in replacement extruder and utilizes the G2E kit parts for assembly. This expands the printer lineup for G2 to any printer compatible with the Orbiter 2.0 orSherpa Mini, and gives the benefits noted above for G2E to every compatible printer. The G2SA is also a extruder, comparable to the Orbiter 2.0. G2 Z-Drive (G2Z) is designed as a compact Z-drive for the for V2 and printers. It features the same 9:1 planetary and stepper in an easy-to-assemble package without the need for belts or pulleys (outside of the Z belt pulley). This design saves considerable space in the electronics compartment for small V2 printers, as well as the 120 and 180 printers, allowing for more room where it's needed most. On larger V2 printers the is smaller, but still includes the higher gear ratio (up to 9:1 from 5:1) for increased print resolution. There are also multiple applications for user outside of the V2/ printers, such as a belted VO Z drive. High-concerned chemical： None Model Number： 7G2K Item Type： Extruder Color: As Shown Material: Plastic+Metal Package Contents: 1 * for 2 Extruder Kits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.