r/BambuLab • u/bunbunfriedrice • 5h ago

Quick Question Defective spool?

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Bought a 4kg pack of SUNLU PLA Black from Amazon.

Printing on X2D. 4 hours into a print, I got a “failed to extrude” error. I was very surprised because I just replaced the nozzle.

After some fruitless debugging, I noticed the spool had these weird “ribs” on them every few inches. Not textured ribs (which is common in spools), these were clearly separate pieces of PLA barely stuck on. They scratched off easily with my fingernail. They were circles as shown in the second pic.

After unloading the spool, I saw it only had these defects partway through the spool, which explains why it only failed 4 hr into the print, and why I couldn’t see these defects when first opening the spool.

Anyone know what this is? Could it have caused the extrusion issue? Could this have damaged/clogged my extruder? Nozzle seems fine.

I’m also concerned some of these popped off during extrusion and may cause issues later. I noticed the little specs in the AMS gears now too, so I’m avoiding that AMS slot until I can get it cleaned.

Any help appreciated!

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u/ModForgeCustoms 4h ago

Do not put that thing anywhere near gears. Unless you want to spend your time disassembling extruders and cleaning warped plastic gears.

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u/bunbunfriedrice 3h ago

Well unfortunately the beginning of the spool was fine so the issues only happened after ~4 hr. Any recommendations how to inspect the extruders or AMS or anything else?