Summary

Today I learned that candle drip trays exist, and are called "bobeches".

This bobeche is a modification of https://www.printables.com/model/825477-parametric-candle-drip-protector-antidripper/files to make it lighter and more elegant, better suited to accompany this candlestick.

Fits perfectly on a regular taper candle. Of course, be aware that most 3D printing materials are both flammable and soften when hot, and don't let your candles burn down too far!