Can you 3D-print toys for gliders?
Is it safe?

I don't know if its toxic if they try to chew on it. dunno

I might make things like rings they can carry around, or balls/other 3d shapes for a toy pit, or hanging cups with hooks built in for hanging. (if safe)

I just don't know if its safe.

The items probably would not be completely smooth, and I don't know what type of plastic is used.