fan funnel reduction 25 to 50 mm for rebel2.stl

I didn't want to buy small fan (25mm), because I head plenty of the bigger ones (50mm) when I needed a fan for my coldend (cooler) cooling. I had a 25mm fan cooler mount piece (blue on the photo) which came with the printer parts so I've done a reduction.
Originaly it is planned for a czech printer REBEL2, but you can use it with anyithing that works.

You will need

• <2, 4> M3 - 10mm bolts for the 50mm fan
• <2> M2 - 5mm bolts for the reduction to cooler mount

As I didn't designed it with axial symetry - to be as high as possible (why not if I can :) ), so I didn't manage to insert M2 holes in every corner only in the two upper ones. So after bolting there is a small gap on the bottom, but nothing what the insulating tape would not handle ;)

It printed just fine with slic3r over repetier host on 0.4 nozzle with PLA. I thickened the most tilted wall as it seemed a little too steep and thin.