This one didn’t print right but I’m gonna try it again later I might change up the color too
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You can insert any custom GCode at any layer, at least with PrusaSlicer. So check what your printer supports for changing filament and try that.
OK... looks like I could play with M226.
M226 waits until a pin's value changes - you have to know the numer of the pin.
M43 allows you to display the pin's value. I may find a pin matching with the user's button.
These two exotic instructions are implemented in my shitty printer (from the documentation). I have to try it.