It is much easier to make a bicep than it is a helmet. Also, print a Bicep with the scaling you have decided for yourself to make sure that it fits properly. After you print, double check that all flaps have numbers on them. This may help other areas as well, where it could come through a bit tight. So you may want to add two or three inches to your actual height before doing the math. You don't really want the top of your head to be touching the top of the inside of the helmet if you expect it to fit right. Note: Keep in mind: the size of the default scale that's in use before you edit is from the base of the ground to the top outside of MC's helmet.

Enter the number you found in step 4 in the 'scale' box.pdo file, and go to the 'scale' and then 'scale factor'.

Take the number you found in step 3, and multiply it by the current scale (usually around 31.9).Add 4-6 inches to that(If you don't,your armor will not fit).You can use this formula to determine how big you should make your armor: The Master Chief is 7'2' tall (86 inches).

Pepakura maker