Keying Plug for .156" Card Edge Connectors

thingiverse

This plug fits old school .156" card edge connectors perfectly. It's designed for wide key slots and works like a charm. Unfortunately, these keys are rare, but easy to print on your own. The 2.3mm height of the plug matters a lot - you either need to tweak it with a file or adjust your slicer settings carefully to get it just right. I printed mine lying flat without any issues. Keep in mind that this is a tiny part.