This is a sphere-based cloud with a channel on the top to thread a line that you can hang it from.

Two models (top and bottom) must be glued after printing. Design is split into two to avoid the need for unsightly supports, supports may still be needed for the channel in the top portion.

Scales well. I've printed at 300%, 200% and 150% with good results.

I am using this in a mobile for my Son's room.

https://www.thingiverse.com/thing:3887830

*Cloud not actually fluffy.