Whether you play yourself or not, it's always good to keep those souvenir balls from rolling off the shelf!
If you'd like custom text on the side, drop me a message or just edit it yourself - I used TinkerCAD and InkScape (the font is "Buffalo Nickel").
Also check out the baseball version :-)
The plain one works fine at 0.3 mm layer height, but I'd recommend a higher resolution if you print one with writing on the side. I printed mine in PLA with 20 % infill, but you could go even lower if you want.