I agree with everything here, , whilst I am fairly new to quilting, I have been sewing forever and previously had a wedding dress business, and the old addage you can't make a silk purse out if a sows ear comes to mind. If you want your work to look its best, choose quality fabric, pre wash, measure twice cut once and ensure you seam allowance is accurate. Half a mm on one piece will be multiplied by the amount of blocks in your quilt.