Davinci Top Duct Layer Fan

This is a duct to use a 5v 5015s centrifugal fan (from ebay or amazon) blowing through the hole above the extruder stepper motor. The duct just clips into place and need no extra attachments, the air passes over the extruder, past the hot end heat sink and through the existing curved duct down to the hot end, creating a layer fan (of sorts!)

I got the fan from ebay, its a 5v 5015s centrifugal fan and costs 99p (in the UK!)

The photos show an early version printed without the fan, which I u