A simple Cowbell print with functional moving bell arm inside that will move around when you shake the bell. Of course it wont make a metallic sound like a normal bell but it does make a relatively close but dulled sound for a plastic print! 

Assembly instructions (inserting bell arm into bell body)
Once printing is complete, the inner support should pull right out and the handle supports can be removed easy.

After any brim removal insert the round ball end of the arm inside the rounded cup found inside the main bell body.

With a little bit of force it should go in!

After that give the bell a shake and it should make some noise! 

If your bell arm does not move around much or gets stuck it may be if its not printed smooth. If this occurs try sanding the ball portion a little but not too much or the arm may fall out! 

The model sits about 10cm tall and the whole thing prints in less than 3 hours on an A1 mini in PLA.

Filament used in the photos is CC3D's Antique Gold PLA+.