See discussion here: Dual Extrusion Head: Heat creep? More likely: Bad feeder! - long story short: There are problems with the feeder, but if they are responsible for the fails is a matter of discussion. Also, firmware pre-1.15.21 according to changelog had a bug where the hot end fan switched of in certain situations, so heat creep might have been a problem after all.
On Facebook and here there are reports for people running long prints successfully, some even with great results, while others try and try and fail. So, might once again also be Snapmaker’s bad quality control.
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