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Cool! Step size has to be defined in the grbl settings! If it does 10 mm when it should have done 5, you have to set the number of steps per mm to half of the current setting.
Ah, now I see. Yes, it should be possible to power them from the arduino instead.
The power of the arduino is too low for the full RGBW strip. You do need external power. ;)
Awesome!! Thanks a lot for sharing this, it's very cool to know that somebody made it!
Build a 30$ laser Scanner
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