Toolboard Grounding

[kiendeleo]

I am working on the proper implementation of the Toolboard connected directly to the 6HC Mainboard on a CoreXY machine. In the documentation, I noticed this:

We recommend connecting the hot end metalwork to ground on the toolboard via a resistor (10k to 1M Ohm), if it is not grounded through its mounting system. This will prevent the hot end building up static charge, which might otherwise occur as filament is extruded and may then flash over to the tool board thermistor input, causing damage.

What are the best practices for this?
Can you hook the resister to the ground of an unused port or does it need to be the primary power port?
Is there a ground plane on the tool board that is hooked to the screw mounts like on a computer motherboard?

[dc42]

@kiendeleo yes you can connect the resistor to the ground pin of an IO port.

[kiendeleo]

@dc42 Good to know thank you

[dc42]

@kiendeleo BTW the reason we suggest a resistor instead of a direct connection is so that in the event of a short between the hot end metalwork and the hot end heater wires, you won't get a large fault current fed into the ground pin, which would likely damage the tool board.