Found this today on a roll of BambuLabs matte PLA, there was a chunk of black garbage in the middle of the filament which was causing it to be extremely brittle. Just wanted to throw this out there, filament manufacturing is still more of an art than a science. Even the big companies stuff it up sometimes!
Just thought this was an interesting discovery, haven’t seen an extrusion defect as bad as this one in quite some time, but they definitely still happen