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No problem. I'm fairly new to this - just got my printer in Nov, but I've learned a lot :p

Another thing to try, is to slice a section (maybe only 3 blades) and try printing that. If you only do a 1-blade section, it won't get ample cooling time between layers & can invalidate the test.

If the ring is looking good all around, I'm not sure it would be any bed leveling stuff, unless the size of the ring can overcome the error. Is this detachment consistent around the entire set of blades? If not perhaps it is something with z-calibration - but then again, I would have thought you'd see that in other parts.