About this 3D model

I have a Prusa Mendel Longboat. It has an aluminium X carriage and J head nozzle hot end. I couldn’t find a duct that would fit so here’s my version to fit the Longboat. If accommodates a 40mm x 40mm fan and will clamp on to the edge of the aluminium plate. I’ve also designed a MOSFET controller to control the fan using a Sanguinololu with Sprinter firmware. Schematics, instructions and firmware modifications to follow. UPDATE: See http://www.thingiverse.com/thing:22202