Check out the original video:

Using PETG and/or PLA as a snug support interface for 3D printing. This example uses PLA as a support interface for PETG on a Bambu Lab printer with an AMS, but can be modified to use PETG as a support interface for PLA. Can also be applied to other multi-material devices and other slicers. #3d #3dprinting #3dprintok #bambulab #bambu #x1c #bambustudio

Filament Selection:

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Support>Support Settings

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Support>Filament for Support

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Support>Advanced

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What that looks like in Slicer Software:

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