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I print a lot of silk filament which is notorious for swelling as a result of heat creep in the extruder.
note- the main reason I got the pop cap was to reduce noise. I don’t need a heated chamber. I already have printers with that. The pop cap does reduce noise but the flip side it traps heats needles to say. With the cap on the chamber goes up to 47C which is an issue for me as I print a lot of silk. With the fans the chamber temperature goes down to 33 C which is more than adequate.