Quadstruder K7 v2 - Dual Drive Extruder

Updated version of the quadstruder using stainless steel gears instead of brass. The brass gears in the previous version were showing a fair amount of wear after several months of use. The stainless gears should last longer, but I haven't tested them for very long.

Designed to work with 1.75mm filament. It uses 2 filament drive gears and two gears to keep the gears in sync. The secondary gear is tilted to adjust the pressure on the filament. Shorter 2mm M3 set screws may be needed on som