Designed this specific cat toy to put a little bell inside of.
This is much more heavy duty then most, which will give it more weight.
Will need to print with supports but only facing the buildplate

Printing:

Infill: 20%
Supports: Facing build plate (Touching buildplate)

ALSO YOU MUST SCALE IT!!!!
It converted it to mm....
So with uniform scale on, change the x or y to 30 mm, totally up to you but SCALE UP
Stupid, I know.....
I will work on remixing the 3D model so you don't have to mess around with changing the scale