When using PETG for a support interface for PLA (or vice versa), does the color matter so I don’t get scarring, or can I use any color? For example, would white or black be better to use?
Color doesn’t matter in my experience. I typically use a contrasting color so when I remove my supports I know I’ve removed all of it. It’s a good way to use up short spools as well.
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It does not matter. I use a different color so I know where to start prying.