This original COREi64 design is a replacement part for the port plate for the Commodore 64 Breadbin style computer.  

If you happen to be building up an old breadbin and find yourself without the original port plate, this is a replacement part designed to take it's place.  Printed in black PLA plastic, this part fits in place of the original.  In some cases, if you have an RF shield attached to the bottom of your board, you may need to adjust the area around the mounting points as I had to thicken the base to add strength where the original metal part didn't need it.

See the included photos of it mounted in place.