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The Prusa CORE One is equipped with multiple electronic boards. The slots on the electronic boards have a label near them indicating the component to connect to each slot.
The xBuddy board is the main board for control of the whole printer, managing power distribution, motion control, and communication with peripherals.
The xBuddy extension board is connected to the xBuddy board. It manages controls related to the chamber and features an MMU port and an additional USB-C port.
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| xBuddy board | xBuddy extension board |
Locate the xBuddy board case. Looking at the printer from its rear, it is the rightmost case.
Using a T10 Torx key, remove six M3x4bT bolts to release the xBuddy box cover.
The bottom larger board is the xBuddy board, while the top smaller board is the xBuddy extension board.
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The LoveBoard is a compact connector board on the Nextruder side, serving as an interface for wiring between the xBuddy board and Nextruder components.
Using a T10 Torx key, loosen and remove one M3x6rT bolt. Then, release the side cover.
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The loadcell and filament sensor connectors are located on the right side of the LoveBoard. To access them, loosen two M3x6 bolts to remove the cover.
The stepper splitter cable connects the three z axis motors to the xBuddy board.
How to accessThe stepper splitter board is located under the printer, inside the frame. To access it, tilt the printer on one of its sides.
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There is NO reason to mount on standoffs, they just make debugging more difficult. I had to cut the heads off the standoffs to remove them. Now my breakout board is double-stick taped to the underside main plate. Easier, visible, and workable.