- The Cloned Bondtech BMG utilizes an internal gearing ratio of 3:1 together with precision cnc-machined hardened steel drive gears to give you a compact powerhouse for all your applications. - Bondtech Dual-Drive:Bondtech's unique Dual-Drive technology delivers uninterrupted material flow without fear of grinding or slipping in even the most demanding conditions. - Adjustable Tension:The thumbscrew tensioner allows the user to fine-tune the pressure exerted by the drive gears onto the filament.- Full kit, includes even allen keys, - This extruder is sold without motor.