Ramps 4 housing for my Prusa I3. Disadvantages of the original fan: Replacement by a low-speed fan 60x60mm COSTECH D06A04LWB, 12 V More about fan replacement at Prusa found here: http://www.kinder-technik.de/2015/08/prusa-i3-hepestos-luefter-tauschen-und-ramps-4-gehaeuse Mounting holes in the fan 50x50mm distance. Mounting case 3x M3 screws. Mounting fan 4x M4 screws / nuts Mounting lid 4x M3 screws / nuts The cover please print with support! Mounting options of 4 Ramps housing: Please make sure that the cable does not come into the fan. The M3, M4 press nuts if necessary with some heat into the housing. The side walls are 2mm thick - not breaking. Gap for LCD cable provided. Prints if necessary a protective grid for the fan. Please make sure that the case is not pressing on the reset switch from Freeduino or ramps !!! Possible improvements: