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Thanks, that clears it up, I somehow missed your first post of the Single_5015_fan_mounts.png. It threw me was that the dual fan duct had both screw holes on the 5015 fan line up, while the single fan one did not.

For posterity, the two parts that had me confused were Hero_Me_Dual_5015_Duct_Gen2g.stl and Hero_Me_Single_5015_Duct_Gen2e.stl. I've attached a different overlay of the two STLs I did in Cura that (to me) shows more clearly the difference. Neither part was scaled, they were only positioned to overlap. This it shows clearly that the single and dual 5015 fan ducts have different dimensions for the two holes in question, which is by design. I'm a bit curious though why the design is that way.

In any case, thanks again for all your work!