This is a better, stronger, cop out of a upload per day.
This allows the circular pins to be printed circular.
If you like this, try other Billy pins:
20/01/16 IKEA Printable Billy Pin. http://www.thingiverse.com/thing:1275431
By printing these pins at 45° they self-support, and are round yet still are both at 90° to each other.
The PK2 Files have also been included for you to modify this if you need something similar but this doesn't quite tick the boxes.
EUR ING Andy Southern