About this 3D model

I use this on the free extruder space on the Tricolor printer to cool the PLA from behind. It's based on animator75's hose-cooling rig. http://www.thingiverse.com/thing:281673 As a air-source I use a O'brien 12V Inflator 0.5psi (Water toy inflator). From the out flow I have split the air into 8 different 6*4mm (6mm outer diameter) aquarium tubes. But you could probably use an heavy aquarium pump as well. Fit it to the forth extruder-place on the back of the machine with M3 nut and a 10-20 mm M3 screw.