HAPPY HAPPY JOY JOY! Congratulations on your success (in spite of lots of obstacles thrown in your way)!
So what makes you think the #6 piston is cracked? Unplug an injector or coil, and it went silent?
Looks like you need to run a RAMBo board in the 3d printer. It's what runs mine. But they are not cheap, yet robustly protected.
OCTOPRINT firmware for the raspberry pi can make it wirelessly managed on the home network.
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