Here's a Christmas tree I modeled in Fusion 360. I wanted something more curved and organic than the geometric faceted trees that are popular. There's a hole in the base for an LED tea light. I have modeled and added a holder for the LED tea light. I print the tree in spiral mode at .2mm layer height. I suggest changing the print setting to 8 layers for the base, to add strength. The tea light holder is printed as normal with a .2mm layer height.

UPDATE: I had discovered some of LED tea lights I use are slightly different sizes. I have modified the light holder and base of the tree to accommodate the change. They're posted as V2 of the original models.

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.2mm