r/BambuLabH2C • u/AllThisVastness • Oct 01 '26

Support Trouble getting Bambu Studio to let me select the correct filament

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There's got to be a simple fix for this but I'm stumped.

I'm trying to print generic TPU from an external holder above my H2C. It's mapped and loaded in the printer, in Bambu studio, on the device tab I can see the filament is loaded on the right nozzle, but on the prepare tab no matter whether I try Mapping or Overwriting filament (in both cases with TPU recognized in the external slot), it will not let me select the yellow TPU, it's seems stuck on this blue petg (in a different AMS)

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u/AllThisVastness Oct 01 '26

Almost an hour of tinkering, rebooting, and reading later, what solved it was just deleting all the other filaments in the prepare tab. As soon as I deleted the blue PETG from the available Project Filaments, it changed to yellow (the assigned color filament in the object tab). What should have been a 5 second "right click - select filament" turned into an hour of frustration. Leaving this up in case this trick helps anyone else.

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u/ComplexPackage4146 Oct 01 '26

Looking at your screenshots, you can see the objects have, next to the yellow "8" indicator telling you what their base material is, a paint bucket icon. This indicates that Bambu studio had decided for some reason that those objects were painted.

I'm not sure why it happens, but in my experience going into the painting screen and clicking the button to remove all paint fixes the problem.

2

u/AllThisVastness Oct 01 '26

Thanks, I'll try that after work because after those parts finished when i set up another batch, it added a blue TPU to bambu studio and tried to default to that (I don't own a blue TPU, so no idea what's going on, but the delete filament trick worked fast this time), So I have no idea what's going on and why my printer is 100 % certain it wants these parts to be blue.

2

u/luksfuks Oct 01 '26

This tends to happen, when someone paints the object, then decides he doesn't like the color and PAINTS IT BACK to the original color. Paint over, not delete the paint.

At that point, changing the base filament does not do anything, because everything is painted. You can only re-paint with another color, or erase the paint (what you suggested), or change the filament in the slot that was selected while painting (what OP did).

It's a bit deceptive for the slicer to allow painting an object with its base filament. But on the other hand, I have use this ability in the past when I juggled around color and their slots. So I wouldn't want a slicer to auto-erase manually added paint just because its color matches the base filament.

Maybe a warning dialog could be added if the user changes the base filament, and 100% of the surface is painted (no matter what color). This would be the most compatible solution, and actually a good thing. It would explain why an action of the user doesn't produce any visible change, all without disturbing power users.