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Started a print today and saw that something odd was happening, so I bailed out of it. Check out the picture, would this be a problem with the nozzle? It looks like it extruded in a spiral!

Your nozzle is to far from the glass. Check your zed height.

Yeah, you would think that the nozzle wiggles while printing this, but it doesn't, does it?
I once wondered how it made such nice consistent curves. Looks very alike and the Z was too high indeed.

Same effect as drizzling Golden Syrup, which Wikipedia assures us is a Newtonian liquid so it's behaviour must be the result of fairly simple forces. Nature is beautiful sometimes.

Thanks all, that was the problem. Not sure why my calibration is changing like that. I've set the zero height only to have the next build crash on the first layer due to the nozzle cramming into the bed. Then the opposite other times, like this example with the wiggles.. nozzle too high.