Direct links to the original Prusa electronics assembly guides: MK3 (B3/R2 design), MK3 (B7/R3 design), MK3S.
Insert the heated bed wiring and textile sleeve (or spiral wrap) through the right of the electronics cover. Secure them with the printed part and 2x M3x10 screws and 2x M3 square nuts.
This is image shows the design of the MK3 B7/R3 or MK3S electronics cover. The MK3 B3/R2 design is slightly different. Refer to the Prusa guide if necessary.
Using a Philips screwdriver, connect the heated bed wires:
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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