I have heard that on the Sparkx i7, or any multi-color printer, that you can use PLA and PETG together, one for the main model and the other as the support material so supports separate easier.
I used my scorpion models
https://www.crealitycloud.com/model-detail/scorpion-printing
How it should work. https://youtube.com/shorts/XjihZYQM7TY
Sliced and actual print.
Removed supports. https://youtube.com/shorts/uOhWcZtejBc
My conclusion was that it was not really all that helpful, at least on a complex model. Try it yourself, if you are so inclined, and comment below on your results.