One clip (Nut Holder V2) which holds the nut from the stock extruder from QU-BD, so you don't need to hold the nut while you're tightening the extruder clamp.
This clip has M3 holes which docks onto a fan holder for the stock fan (or anything else you might want to make) with a couple of M3 screws. The fan holder has two ducts, one for the print, and one to keep the top of the extruder and extruder stepper cool.
All prints with no support, and even in poor resolution. SolidWorks files also available.
Hack it up.
Prints on your one up / two up with no issues.
Rotate the nut holder so its legs are pointing up, and the fan holder so the duct is pointing upwards. If you're sitting in on the print, you could hold up the 40mm fan when it's doing the bridging, just to make sure it all sticks together correctly!