Burnt PLA?


This was a recent fail. It has happened a number of times, and I am wondering if this is a common thing. Burnt black and brown bits, failed print.

My theory: I am beginning to suspect it happens after I switch back to PLA after printing PETG at higher temps. If I have PETG in the nozzle, I have to heat to PETG temps but put PLA through behind it, and I think the PLA is getting burnt and stuck and finally comes out later, wrecking a PLA print. (???)

Any ideas? Thanks in advance! :)


77ticktock 05/26/2019

I can't personally attest to this but I imagine this filament cleaner will benefit me as well when I switch between PETG/PLA.

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