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I'm attempting to make a custom controller for an old game console, and I'm looking for a way to replicate the conductive coating on the traces for the button pads: https://i.imgur.com/CsCwdQJ.jpg

I'm harvesting the silicone pads from some old broken controllers for use in my custom one, and plan to have a custom shell/buttons resin-printed, I just need help figuring out what to use for the trace coating. Does anyone know of a product that could be used for this?

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It's a layer of conductive carbon ink. The process is available from some PCB fab houses (usually as a custom order item), or you could buy and screen-print the ink yourself.

I wouldn't suggest hand-painting it, as it's likely to come out rough, or not adhere well (crack/flake?). Needless to say, surface prep is important regardless.

I don't know the over/under of using other materials (conductive silver epoxy for example), and it may be that some of those are usable, durable, as well.

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    \$\begingroup\$ You can also use anything else conductive and non-oxidizing for this; using a hard gold plating for the PCB, while expensive, would also work. \$\endgroup\$
    – Hearth
    Dec 9, 2023 at 14:59
  • \$\begingroup\$ Thank you very much! \$\endgroup\$ Dec 11, 2023 at 19:58

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