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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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My understanding is that PLA and PETG will not adhere together, so I guess if there's any residual PLA when printing the PETG it will cause it to not adhere fully. Makes sense and is a perfect example of where a tool changer would be incredibly useful.
I'm assuming you're using PLA to support the PETG parts because of their inability to adhere to each other? Don't know if you've seen it, but if you have relatively large, flat overhangs that need support, you can color in the top layer of the supports with a permanent marker. This will cause the same inability to adhere and you can snap the part off easy. Not really practical for multiple areas of support or if you need something like tree supports, but if you've got angular parts or similar could save a lot of time