Commodore 64 keyboard pin. It probably fits other keyboards of Commodore family, this I haven't checked as it was a "I broke it I need a new one" for mine type-of project.

The prints are from a previous version that did not have any fillets and the seat for the rubber bit was a bit too wide.

I will try to make it fit absolutely perfect but with this level of detail you have to be aware that we are close to physical limits of what printing can do :)