Minecraft Helmet for original figurine

My kids wanted me to print different helmets for their new Minecraft figurines from the toy shop, so I reverse engineered the original helmet that came with one of the figurines. I've printed them in 3 colors and I noticed that for some PLA colors which I had the hole needs to be a bit smaller, otherwise helmet is too loose. Print 17.7mm first and if it's too loose then try 17.5mm version. If you need other dimensions let me know and i'll try to add.