I remixed drawings of a larger candlestick from craftsmanspace.com to be shorter and thus faster to print. Version 2.0 now has a removable insert, that should be able to hold all candles 21 - 23mm. It's also meant to be printed in a more heat-resistant material like ABS/ASA, so it doesn't deform as quickly when the candle is burning low. In addition the lower portion is mostly hollow and prepared to be filled with a weight/ballast, in my case plaster from the local hardware store. The model is very easy to print and offers a couple of good places to insert a color change!

printed on modified Prusa i3 Mk3 (yes, my Z-seam isn't so great...)