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This is a remix of Simple Christmas Tree that is simpler to print (original: https://www.thingiverse.com/thing:1962328). It is laid out flat, for one, and has the bevel removed from the bottom surface to ensure better printing. It also has a new base that wastes less material, holds the "stump" deeper, and and is keyed to fit the new flat back side.

No supports needed (obviously), but you might want to print a "brim" to help with adhesion around the sharp corners if your printer struggles at all.

This is a very large design, like the original, and I've been printing it at 75% scale (in the slicer) or smaller to fit my Ender 3 v2. The photo with the green trees show two at 75% and one at 60%.

I'd also consider enabling top layer ironing.

For best results on the tree, you really want to use a concentric infill pattern. It works much better for the super skinny line that makes up the tree.

Creality

Ender 3

Doesn't Matter

No

.25mm

10%

I printed the eSun PLA+ at 205C with the bed at 70C with a 5 line brim for adhesion.

I use top layer ironing to smooth things out.

NOTE: Use Cura's "concentric" fill pattern for best results with super skinny prints like this (I print at 10% infill). This gets you faster prints and better results, in my experience. Other infill patterns result in constant slamming back and forth of the direction the print head is moving, and results in a lot of very fast succession retractions, which often led to the extruder grinding the filament.

This was made in Tinkercad by importing the original STL file for the tree and removing the bottom 3mm and then stretching the remainder up an additional 3mm.

https://www.tinkercad.com/things/9nNdIfP6ZRl-christmas-tree-outline-top

The base was also made in Tinkercad by using a beveled cylinder, cutting off the bottom, and then using the stump of the tree as a negative space and merging them.

https://www.tinkercad.com/things/jYxeHxNdpR7-christmas-tree-outline-base