Reibuehl, there is a lot of discussion about this here:
https://ultimaker.com/en/community/17794-detailed-documentation-of-our-hardware-and-software-mods-for-reliable-printing?page=1
But the short answer is here:
https://www.youmagine.com/designs/print-head-bottom-modification
reibuehl
over 8 years
Today I tried to mount this fan duct on my UM2 but once it is installed, there is no room anymore to get the heater and temp sensor cables into the lower plastic part of the head. Is there another way to do this?