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Yeah, the hexes print really well.  I do have a fan going at about 25% of max.  It bumps up to 45% when bridging.  A lot of guys will print CF PETG at minimal to no fan at all.  After lots of testing, I found a sweet spot with higher extruder temps with more cooling.  This was solely for the ease of removing support material.  The extruder lays the filament down hot enough for good adhesion, except in areas where there is an intentional gap between the case and support.  In instances like that, the extra cooling keeps the filament from drooping and adhering to the last pass under the gap.