About this 3D model

When you are printing with your PrusaBox is important to maintain cool your einsy and RPi, at the beginning I was using the cooling duct designed by @colin but when I mounted the RPI It was not able to fix in the correct place, so I have enlarged 25mm the cooling duct. Also I have changed from M3 hex nuts to M3 square nuts so this way is easy to assembly the fan.