Mini Kossel j-head mount with 40mm PEEK fan and dual 40x40x20mm blowers for layer cooling

So rather than trying to compress air using a couple of axial fans as in my other design http://www.thingiverse.com/thing:696299 I thought I'd give some centrifugal/blower fans a go instead as they will fit quite nicely into the space available under the kossel mini effector without requiring any additional ducting etc. that may hit belts/towers.

The blowers I'm planning to use are 40x40x20mm and can be found on amazon/ebay for a few pounds.