Designed for children birthdays, you can configure the number of holes on each ring (and the size of the rings). You can also engrave a small logo in the middle ring if you don't put any hole there.

It's upside-down in the model for easier printing, don't hesitate to put some support if you engrave a logo that requires it.

The included STL is with 9 candles and an engraved koala, but feel free to play with the openscad file.