Watch the video and follow along to make your very own 1960s comic style Iron Man helmet
The template is made to fit my head, which is 58cm around at the eyebrows. Just take the measurement of your head and divide it by my measurements. The two digits after the decimal is the percent you print it.
Example: If your head is 50cm then, 50 / 58 = 0.8621 print templates at 86%