If you want a professional finish:
This avoids all the mess of etching .
You won’t be doing this if you don’t have a CNC mill. So, only to add to the mix of things to know and avoid etching… mill it.
CopperCAM has a feature to mill all the copper off (except the Pads/Traces/other…). One click and done.
Screenshot
What a fun project!
The festo board you’re refering to seems to be using this type of lab connector jack: https://www.digikey.com/en/products/detail/keystone-electronics/575-4/318493
If you open the datasheet, there’s unfortunately no specifications for the part footprint. Footprint meaning the hole- and pad size that you design into the PCB wherever you want to mount the jack. But if you decide to use it I’ll help to decide a proper footprint spec.
The datasheet also lists some alternatives you can consider for banana jack/lab cables.
Sure you have to make it so large? I would think it’d be fun to have a handheld version using smt resistors, machined header sockets and jumper wires, then PCBs would be dirt cheap.
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