I saw there was some circuit stencils in the page. However, all them where small and "card size" like. I didn't find the utility of having the in a size so small because most of time I carry it in a backpack or a tool box, so I decided to create my own and add a cm ruler to it.
In this one I added the main symbols for electic circuits and logic gates.

Supports don't needed. It has no infill, if you print with the original size is only 2mm high, so its all walls.

The size of the ruller is 159mm long, 59 mm wide and 2mm high.

Please, give feedback and suggestions for future versions.

Anycubic

Kobra Go

No

No

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I used a 0.4 nozzle. In this case the ruller isn´t very detailed, but if you use a narrower one, it will be probably better.