Measured and model from a basic candle size from Bath & Body Works. The opening is about 73.50 mm in diameter, which will need to be scaled up slightly to accommodate for the candle tolerances. The purple one was a snug fit and admittedly is stuck in the container I printed. So for the blue one, I scaled the X-axis and Y-axis up by 5 units each (Simplify3D). The candle sit perfectly inside, and can then be removed easily to exchange out.