Knocker

Be aware.
Keep this out of reach of your children.

But if you want to tease your friendly family…
Make a gift.😉

You can also enjoy the click-clack yourself
and find out that you can create your own rhythm by controlling speed 
and through your handgrip change tone.

Print-in-place model.
Print it with 3 lines and min. 30% infill for the weight.
PLA or PETG both will work

If you want different colors you can press the outer ring together and push the bell in or out.

Have fun!