This free printable iron is for non-commercial use only, not for resale or manufacture of items for sale. To download:

For Windows, right click on the image;
For Mac, click and hold. In both cases you should get a window from which you can choose "save image as."
For Mac Tiger & later, <ctrl><option><click> (gets more complicated every year, doesn't it?)

When you print, you will get iffy results if you try to print from your browser. Save the picture to a folder where you can find it, either with the instructions above or
using icons in your tool bar. The images are in "printing" resolution (300 ppi) rather than "screen" resolution (72 ppi.)
That's why you'll get better results if you use picture printing software you're used to. Office supply shops have a variety of iron on media with
complete instructions on fabric, preparation, and printing.