After changing to an all-metal heatbreak and a nickle-plated nozzle, haven’t had any clogs or related issues in over 500hrs of use, all of that at temps in excess of 230C. With this setup, my cold pulls come out just as clean as those shown above, except I can do them at 0C because it releases so easy.
Lots of detail on clogging issues in the forum post linked here. TLDR:
Temps above 240C cause the hotend liner to deteriorate faster (which leads to clogs).
Retraction >3mm causes hot filament to pull into the liner (causing clogs when it cools).
Plus more…
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