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Ultimaker 2 Compact Fan Ducts
Most useful for those who have transitioned to the Olsson block or regularly change nozzles.
I wanted ducts that were compact, allow for easy access to the hot end, and allow for some cooling when required. I don't regularly run my fans so extreme cooling is not a priority for me, although I'm sure these ducts should be more than adequate for most hobbyists.
I've included single files and a print all in one STL. The only hardware you should have to source are 4 M3x8mm screws. The hanging points have been thickened for added support and avoid cracking as most printed fan ducts do. For the mounting of my fans I only used 2 screws and that's more than enough to keep them firmly in place.
This design is currently a Work In Progress.