Flsun cube chimera fan

A part cooling fan for the Flsun cube + chimera dual extruder. I printed it on it's back and used tree supports. I also printed it on a FT-i3 mega printer, which is setup for abs. It does require a pretty good size bridge surface. I printed this 4 times and didn't have a problem with the bridging.
Also, included an igs surface model.

Added a 40 mm axial fan version.