This is not really IDEX and not really multi material printing, BUT...
https://github.com/Sakati84/3DPrintColorizer
It is a tool changer, which swaps from printing to coloring and back. This looks kind of interesting and removes all the issues one has with filament color change, but having a bunch of sharpies and colorize the layer right after it got printed is a cool idea.
I guess the next step would be a robotic arm, painting the finished print.
https://github.com/Sakati84/3DPrintColorizer
It is a tool changer, which swaps from printing to coloring and back. This looks kind of interesting and removes all the issues one has with filament color change, but having a bunch of sharpies and colorize the layer right after it got printed is a cool idea.
I guess the next step would be a robotic arm, painting the finished print.

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