This is a dual drive remote direct extruder with Bondtech gears and custom 3d printed 30:1 worm gear. It is designed to combine dual drive extruder benefits with very low weight (compared to direct drive system), high resolution, much easier retraction tuning (compared to bowden system) and faster printing with flexibles specific for the remote direct system. So if you have some Bondtech gears laying around, now you can make your own copy just buing some minor parts and 3d printing everything else by yourself.