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If I remember correctly, there was a section of the nozzle that is hollow, but completely enclosed.
Due to the geometry of the part, I needed to have supports enabled.
The part was supported properly, but then this section of the nozzle also had supports in it. They were all internal, so there would be no way to remove them. I would have thought that it would just put infill in there normally...but it didn't.
To get around this, I created "support enforcers" in Fusion 360...and used those to mark the areas in Slic3r that I wanted it to add supports. Alternatively, I could have used a "blocker" to block supports from that area.
If I remember, I'll try to take a screenshot of it tonight.
Everything printed fine, and it would have probably been fine without me "fixing" anything. I just didn't want it to waste material putting supports on an internal area where they clearly weren't needed.