This is a simple Bulldog extruder mount for a Prusa i3 which is based on the mount that comes with the Bulldog kit, it can be used with either a Bulldog Lite or XL Extruder. Also included is a 25mm Fan Mount which mounts underneath the extruder to cool the print. The X-Carriage which is used in conjunction with this mount is included This mount makes use of the radial fan which comes with the bulldog kit and the 25mm fan which comes with hexagon hotend kit. Visit our website for our full range of parts at: http://ooznest.co.ukParts needed to complete this mount are: Printed Parts of the attached STL's Bulldog Lite or XL Kit Hexagon Hotend Kit 2 x M3 8mm Bolts 5 x M3 18mm Bolts 2 x M3 25mm Bolts 9 x M3 Nyloc Nuts Instructions can be found on Page's 28-31 of our Prusa i3 Instruction Manual Here: http://www.ooznest.co.uk/Prusa/Prusa-Instructions-v1.12.pdf