I wanted a small dual cooling fan set up for my dual extruders. This was the smallest design I could come up with. There are a few more small changes I want to make but so far this design works very good.
Link to the fans?
Use an aquarium air pump to an airline, and you can vastly reduce the size of your on-hotend cooling solution
I did the same on very different printers and found it very, very better at cooling if the fans are mounted at an angle of 30°. https://scontent.ftxl1-1.fna.fbcdn.net/v/t1.0-0/p173x172/13895051_232108880518721_6350959604160813469_n.jpg?oh=d1f0d12eef1b4414e5514508c393371d&oe=581462BA
@Rene_Jurack That setup takes up too much space to work in my current situation. The plan is to extend the ducts down a little lower so they are closer to the tip. Right now the ducts are angled at 45 degree angles.