TOP #9: Brass Filament Drive Gear MK7 Style (Optimized for PLA) 5mm Bore! - www.b3dgeable.com/2014/07/01/top-9-brass-filament-drive-gear-mk7-style-optimized-for-pla-5mm-bore-11/ i0.wp.com/www.b3dgeable.com/wp-content/uploads/2014/07/31enRSSKREL._SL160_.jpg?resize=160%2C160