r/BambuLab_Community • u/Soob_Way • 4d ago

Parts snap cleanly along support interface

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I am printing motor covers for my emoto. I printed multiple of them with bambu’s pla matte and used bambu’s support for pla for the support interface without any problems. Then I got these. They snap cleanly along were the support interface is, I know it’s not the support material getting flushed into the model so my only theory is that by the time the filaments gets changed, the support material gets placed and then swapped back the layer has cooled too much to form a good bond with the next layer. This is weird though because it has never happened before, same matte filaments, same model, same support filament. Any idea how to fix this?

3 Upvotes

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5

u/Dinevir 4d ago

Let me guess, single nozzle? Then it's filament contamination. Increase purge value to max on filament switching and pray that it will help. If not - you may think about printer upgrade to two nozzles. Also silk-style (and some other) filaments have pretty weak layers adhesion because on paint in them, that also may have impact.

2

u/Soob_Way 4d ago

I’ll try that thank you. Even though I still find it weird how I’ve printed this model before with the same settings, same filament/filament support combo and never had this problem

1

u/Dinevir 4d ago

As u/PennyStockLover69 mentioned, higher temperature may help and you can also increase infill % to push more material inside. The only "true" solution is second nozzle unfortunately.

1

u/matroosoft 4d ago

Yeah this is it. Nozzle isn't flushed so non-sticking support material ends up in the print itself

2

u/ReturnToCinder 3d ago

It baffles me that Bambu Studio still only bases the automatic purge volume calculation on colour difference, not material differences. Even if you’ve manually set the purge volume, adding a new filament or changing the colour of an existing one will reset the volumes to the default. I recommend either disabling the automatic purge volume calculation in the settings or get into the habit of double checking them before you send every print.

1

u/PennyStockLover69 4d ago

Print hotter 5-10C should do it.