Shelf support pins break at the worst times, and you never have another one around to put the shelf back in place. Print a few of these and keep them on hand for when the inevitable happens, or quickly print one in less than 20 minutes.

This pin works with 5mm holes. The pin is offset from the support so that it will be level with existing pins.

Print settings:

• Print in the same orientation as the STL for maximum strength. 
• Use supports for the pin part.
• Infill doesn't matter