So this is a Remix from an Anular fan Duct, cooling design I saw on Thingiverse, I remixed it (just duplicated it and made a symmetry) in order to fit two fans at the same time, so that I could get more airflow.You may need to adjust the bottom Y stepper because in some revisions of the ultimaker it may hit the supports of the bed.This is Still In Progress, I have to re design parts of it in order that it doesn't hit the ends, (or adjust the endstops)Any comments on the design, suggestions, or anything will be welcomed!Join the forum: http://umforum.ultimaker.com/index.php?/topic/5108-dual-fan-duct-anular-cooling-system/