Remember to press, or raise and lower your iron. Ironing involves vigorously moving the iron over the fabric and applying pressure downwards. These movements can move the stitches of your fabric. The movement of ironing will possibly stretch them out of shape.

Be careful using steam on your blocks. Steam can help you stretch some places where you may have stitched a bit too close. Steam can cause you to stretch your block out of shape so, again, be careful.

Normally, when you press quilt blocks you alternate the seams so that your block lays nice and flat. You press the seams that adjoin each other in opposite directions. The loft of one will butt into the seam on the other to help create a snug fit. I found that with the pinwheel topper, it worked better to lay the fabric going the same direction. When you alternate the fabric at the seam, it avoids a thick place in your piece. By not alternating the direction of the fabric for the pinwheel, I had some bulk but my points came together nicely. I was able to trim my seams to rid them of bulk.