if you have a lot of retraction points in each layer, the feeder might have flattened a portion of the filament and cant grip it well enough to keep up. If thats the case, decreasing the length of retractions should help. I've had this problem several times before.
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anon4321 16
what is your extrusion rate? Take the layer height * nozzle width * layer speed. For a UM1, it seems the magic number is < 5mm3/sec Not sure about the UM2. So for my UM1, for a 0.2mm layer, I try to stay below 60mm/s (0.2mm * 0.4mm * 60mm/s = 4.8mm3/s) if I understand things correctly...
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