Brushless DC Blower Fan, best DIY replacement extruder hotend parts, This MK3 fan is used for Prus i3 MK3 MK3S MK2/2.5 3D printer Extruder Size: About 50x50x15mm/ 1.9x1.9x0.59 inch; Cable Length: about 750mm/ 29.5 inch Rated Voltage: 5V, 0.35A Please Note: the fan has two sides,but the side with sticker must be always facing the hotend (not visible when the fan is mounted).Otherwise,the cooling won't work properly. Package Content: 2piece 5015 5V Front hotend blower fans. If need more support, please feel free to contact us, we'll assist you directly.