A friend's kids got BeyBlade tops for Christmas, but not a stadium. I saw some here already but I wanted to do something bigger, so I did.

This is 300mm across, then divided into 9 segments, with the centre 200mm to a side. There are also 10mm tabs (2 per joined surface) so your printer must be able to address 220mm to a side to print these. I did some pieces on my FlashForge A5M and some on the Elegoo Centauri Carbon. They're large so take some time to print. May work well printed at 95% size for those with 200mm beds, but I didn't try it.

Printed in PLA at 0.2mm layer height, 3 solid layers bottom, 6 solid layers top, 15% cubic infill worked well.

I left 0.25mm tolerance around the tabs and holes to facilitate assembly, which might be a touch loose with my printer(s) it assembles well though and doesn't seem to rattle. I may recommend that it be glued together, but haven't done that yet. If gluing together, I would probably put posterboard or Dollar Tree foamboard underneath it to make it less noisy.