egg cup set - addition

Was meant as an addition to item: http://www.thingiverse.com/thing:2136060

Uploading this as an addition to the original item resulted in an undefined error message, so posted as a seperate part instead.

Added this 2-piece alternative for the pin, as horizontal printing of the long stick will result in a stronger product and will be easier / quicker to print.

Included STEP source files, to facilitate modification where required.