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Editing Step 30 —

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Direct links to the original Prusa electronics assembly guides: MK3 (B3/R2 design), MK3 (B7/R3 design), MK3S.

Using a Philips screwdriver, connect the 2nd pair of wires from the PSU:

Positive, red wire, connects to the screw terminal indicated by the red circle in the image

Negative, black wire, connects to the screw terminal indicated by the black circle in the image.

Tighten the screws firmly.

Double check that you have connected the wires in the correct order and orientation. Note that the wire terminal should go under the washer of the screw terminal.

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