Get the maximum Z and X height as well as less vibration in Z direction due to the compact design. The spotlight provided by the LED ring really helps to see the print clearer. Mounts E3D v5 with Ø25mm heat sink and a standard Prusa i3 x-carriage with 30mm hole distance. The 30mm fan is recessed for compactness, and the open right side allows heat to escape from the heat sink. The heat sink snaps in place pretty securely without additional support. I made an optional clamp can be screwed in. Also allows for 40mm LED ring which can be glued/screwed to the recessed area on the bottom. http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.X40+mm+led+ring&_nkw=40+mm+led+ring&_sacat=0 http://droopas.blogspot.comPrint with ABS or PLA with ~30% infill. Use support ("Touching buildplate" if using Cura). 0.4mm nozzle 0.2mm layer height Snap in your hot end and a 30mm fan. Secure the mount to the x-carriage with M3 bolts and nuts.