The original design had some flaws that this replacement fixes, e.g. all metal hotend, better cooling of hotend and filament. Design goal was to reuse as much as possible from the original end effector: You can keep your end effector PCB with the cool LED lights and the wiring harness! With this design you can use a proven all metal hotend - the E3dV6. The end effector also comes with a filament cooler that uses a strong blower fan and is magnetically attached to the end effector.There are 3 variants available:- Standard arms with M3 mounts (big connector cutout)- Standard arms with M3 mounts (small connector cutout)- Magnetic arms version