Step 1: Preparing your heat shrink design
Stretch the image height until it is 4 times taller than it should be (now you see why your stacked 4 high). Delete the everything but the stretched image and print it.
Take your smooth piece of party cup and tape it to the computer paper. Make sure it’s taped directly over your reference image. Place the paper back through the printer. Now you should have a stretched printed image on the piece of cup.