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The Basaraba direct drive kit I received about a week ago isn't quite compatible with the dual-5015 ducts. If you consider the square heatsink fan to be "center", the extruder motor is shifted left about a centimeter. This is just enough to collide with the left fan's "wing", so I needed to clip about 1mm off the top (right above the screw hole). In addition, the 5015 blower on that side collides with the motor as well, and there's no easy fix there. Measuring it is a bit tricky, but I think if the left blower mount were shifted either down 2-3mm or left about 12mm, it'd fit. It seems like down is the easier move, though it'd squish the ductwork even more.
I am using the Teaching Tech's refreshed base (https://www.thingiverse.com/thing:3585243) but I don't think that's the source of the problem; there's still room to lower the ducts a couple mm, but then they are below the nozzle.
I've attached a couple pictures that I think explain the issue.
I'm going to give a remix a try, another Basaraba user appears to have had success with this: https://www.thingiverse.com/thing:3481256