DIY mini CNC machine part 10 (spindle round three + easy cuts)

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I must have watched more than 30 DIY CNC build videos/series on YouTube, and never saw anyone else having these frustrating electrical problems... I naively figured this part would take about 20 minutes, but by now I have just about spent as much time on this crap as I did building the whole fucking machine itself, and it's still not fixed!!
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