I have a few updates since I finished crafting the helmet. I've had to remake it two more times. First, my dog ate my helmet. The first iteration was sized too big. I didn't really follow sizing tutorials and winged it. I took the original .pdo file and resized it bigger by 10%, and then again for another 10%. For my second try, I used the original unedited file. That one ended up too small. My chin didn't quite fit into the helmet. My final piece was sized at 10% bigger and it was juuuust right. Notes If you plan on trying out Pepakura, here are some things that I've learned from this experience: When prepping the .pdo file for printing, edit the file so each segment fits on a sheet. In Pepakura Designer 4, press Ctrl + N to "Join/Disjoin Faces". Measure, measure, measure! Although, who knows if I'll follow this tip. I'm a trial and error type of person. Protect your surfaces. Use a proper cutting board. Protect your wrists. Use a precis...