I never got to play Guild Ball but I have some mixed information on it from good game but got a bit ruined in the end.
This article just popped up on my Google news feed suggesting it may be coming back with free rules and free stl for printing.
Here is the link to the article.

https://www.dicebreaker.com/games/guild-ball/news/guild-ball-returns-steamforged-print-on-demand-free-starter-set