I modeled this bell based on the sleigh bell in the 2015 movie Krampus.

The top half has a post with a hole through it, where you can use a length of string or wire to mount a small sleigh bell that you might find at your local craft store. You can also just toss a small sleigh bell into one half before gluing the halves together, but it sounds clunky and unconvincing, so I don't recommend it.

I printed mine on an LCD MSLA printer. I think it would work very well on an FDM printer, as well, if you kept the layer height around .12mm.