About 2 grams each (I know I said 2.6 grams in the cover photo but it was a typo. I put 26 minutes to show time but decided to do grams instead and when I changed it I forgot to change the number and just put a decimal. I'll update the photo soon…
I used PLA and it works great. You can try PETG but it won't really change much besides maybe it getting chipped over a long time.
You should print the “BBX_Ball” file first as it is one of the best bits since it has INCREDIBLE stamina.