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 diameter. 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...)

Print Settings

Printer brand: Prusa
Printer: i3 MK3
Rafts: No
Supports: No
Resolution: 0.2mm
Infill: 10% gyroid
Filament brand: Polymaker Polyterra / 3DJake
Filament color: cotton white / peach / gray
Filament material: PLA / ASA

Notes

print time was ~4h for the body and ~45min for the insert in ASA.

How I Designed This

Used free drawings from here:
https://www.craftsmanspace.com/free-3d-models/turned-wooden-candlesticks-3d-models.html

Very professionally made, check them out!