That's what I figured. Im not sure how you came up with 12k but id set the goal for what you'd need to break even to give it better chance of success. This would make you the owner of the only 12 bolt diff cover mold which could be very profitable.

For example it would be ashame to get ~$8k in pledges which might make the investment on your end lower risk and worth doing, but it all goes away because it didn't reach the $12k limit.

....I could also be looking at it completely wrong. But just a thought to consider.