I just shrunk the diameter of the hole and adjusted its depth. For the Fusion360 file, the original model, or more information, please visit Peter's model post on Printables: https://www.printables.com/model/361662-candle-holder
This model is print-in-place and does not require supports while printing.
Note: There is a slight tolerance added to the ¼ inch diameter hole to ensure the candles fit. I would describe it as a holding fit. It doesn't clamp and hold onto the candle. Only a bit of force is required to remove the candle. This may vary depending on the candle though. I may add some extra models at a later date with varying tolerances. Otherwise, I can upload the modified CAD file to make it easy to fine-tune.
REMEMBER!
If the candle burns down too close to the plastic, it will likely start to melt. Be careful! Consider the safe temperatures for the particular filament and material you are printing with!
The author remixed this model.