Summary

Heads for sizing Updated 9/20/23

Head-1

Axis Long - 7.9
Axis Short - 5.8
Circumference - 21.7
Hat Size - 6-7/8

Head-2

Axis Long - 8.1
Axis Short - 6
Circumference - 22.4
Hat Size - 7-1/8

Head-3

Axis Long - 8.5
Axis Short - 6.1
Circumference - 23.2
Hat Size - 7-3/8

Head-4

Axis Long - 8.3
Axis Short - 6
Circumference - 22.9
Hat Size - 7-1/4

Quest4Nostalgia has a great video to help you get the perfect sizing in Cura.
I highly recommended you check it out.
https://www.youtube.com/watch?v=DVJVYGUvSjI

Mr. Mayhem Smiley has also made a great video if you are using Orca or Bambu Studio.

All Head information is located on the back of the head

All heads are printable now.

Enjoy