Don't forget to add a little for the cost of waste, not IN your design, but you most likely can't butt one design directly against the other. Most people add an inch to the width and height of your design for waste. Plus, you need to figure out how much vinyl is wasted on the edges of your vinyl. Can you fit your designs so that there's only an inch or so on each side of your roll for your pinch rollers? You need to pay for that vinyl, too, even tho it will never ever be used.
I'm not sure where you got your actual 34.5 measurement from, unless you're including the space between your designs, for your actual design itself with no waste is 32 x .0116 = $0.3712
You can fit APPROXIMATELY 12 designs on one yard of your 15" material (3 wide and four tall), so it costs you in actual design vinyl (again, no waste) $4.4544
So the amount of vinyl you're not using is $1.7956
Devide that by 12 ($0.1496) and add that to each design. $0.52(08)
I know that's getting really nitty gritty, but you do need to count all of your costs.
