i have the same problem
the filament burns out in case of the long time in heating area and clog the nozzle.
i have the problem with many cheap filaments and layer high at 0.06.
same problem with new nozzle, tube and peek isolator
try reduce the temperature and print bit faster.
its a kombination process with speed, temperature and flow.
Edited by WowaWie
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neotko 1,417
Check feeder assembly
https://ultimaker.com/en/community/21197-totally-busted-extrusion-on-ultimaker-original#reply-147966
Check hotend assembly and bowden
https://ultimaker.com/en/community/19388-problem-with-i-dont-know-what#reply-134413
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