A revised version of my GeeeTech Prusa i3 Acrylic print cooler duct that mounts to the MK8 Extruder - My MK8 extruder came with a cooling block that had the heat sink fins running in a vertical direction - but I have had several requests to make a version for the heat sink with horizontal fins - This version #2, will work well with the fins in either direction - directing the air from the heatsink fan to the blower ducts and using it as a print/filament cooler. This keeps the system very compact and light. *UPDATE (9/19/2015): Added updated version that has the LED mounting holes if you want LED's on your cooler (illuminates the print) like my ver 2.0 but now for a vertical or horizontal heatsink. The LED's x4 direct light around the nozzle so I don't need to find a flashlight every time I want to see how my print is doing or to inspect/clean my nozzle.LED's I used are: BCMD204UWC (3200mcd, 3mm, 3.2Vf @20mA - 25Viewing Angle) actual measurements are 3.1mm diam with a 3.8mm diam lip at the very top x 6.3mm in length, 3.3v, set in the mounts with silicone or epoxy at the top of each bulb, hooked up in series then directly to the 12v power supply with a separate on/off switch (see my other things for the switch box) - Please post pics of your makes of this item and comment if you have ideas to make it better - THANKS ALL !!!created in sketchup, then checked in netfab for manifold