Features:MK8/MK9 extruder 1.75mm filament wire feed device.Used for 1.75mm filament, Reprap, Makerbot.Equipped with two pneumatic fittings, the feed process more smoothly, you can make your extruder closer to the print head (reducing brushed remote feeding problems arising from this can to some extent), while the supplies can be placed in a more appropriate position, and not worry about other issues stuck supplies)Here are two types of feed device parts--the left one and the right one. Pls choose that you need.Description:Size: 4.7 x 1.4 x 2.8cm / 1.9" x 0.6" x 1.1"(L x W x H)Screw: 1 x 1cm / 0.4" x 0.4"(H x D)Direction: Left (Type 2), right (Type 1) (Optional)Package includes:1 x Feed device Parts for 3D printer (the extruder does not includes)