I don’t know gcode, yet, but what I’ve learned so far it’s not difficult to understand. My question is. Is it possible to install multiple switches and when it’s time for a color change have the hot end go to the closest switch to change color. I understand we talking milliseconds but on a large print with a lot of color changes it could add up
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Sure, each of the switches could be on parallel and it would work just fine. You can also use a GPIO pin to save that same time, that way it's all digital.
Bill