Step 1: Material and Tools
You will also need a pair of scissors for cutting the carton.
Step 2: Cutting of the Lid
First cut of the lid. Then cut away the locking flap.
Step 3: Cutting the Slot
The idea is to cut a slot in the sides of the carton that aligns with the two pegs in the cartons center. Use a pencil to draw a line before cutting. Look at the second picture and you will see that the line lines up with the pegs that will support the ipad.
The bottom of the slot should be as deep as the cartons dimples.
After cutting the slop cut away the front of the carton that otherwise block the iPad screen. Remember to leave at least one centimeter of the slot (see pictures) so the iPad won't slip.
Step 4: Done!
It should be able to support your iPad both standing up and in portrait mode. But I guess that the design of egg cartons can differ so be a bit careful the first time you place you iPad into the stand.