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1 month agoMy guess would be hotend not feeling so good. Those white spots look like result of temperature changes.
If you can read hotend thermistor data somehow (OctoPrint, for example, shows a chart for that) and see lots of sudden ±2-5°C changes - that’d be it.
There are more recent devices from Jolla, Finnish company. The only problem is the price, roughly the same as basic iPhone 17 (≈700€).