This remix of the Top Hat Rubber Duck allows you to print it as a keychain! You will need a keychain ring. Open up the bottom link of the chain and slide it through the hole on top of the top hat!
Note: I know that the model is incredibly off-size. I printed mine at 3% size, but 2-4% should work just as well depending on how large you want your keychain.

Anycubic Mega S

No

Yes

.2 mm

15% Cubic