I printed this christmas tree with dried (!) "Crystal Clear" PLA, one bottom layer, two top layers, one peripheral layer and no infill (except the base which is printed with 20% infill and three top layers). The idea behind this clear slimline printing is to bring as much LED tea light to the top as possible.

Stack the parts on top of each other and glue them e.g. with superglue or (as in my case) Revell Contacta PROFESSIONAL. 

The christmas tree baubles have a sphere diameter of 20 mm and overall height (including loop) of 30 mm. I found them in a local shop (now sold-out). Maybe Amazon has them as well (search for "baubles 2 cm").

The illumination is provided by a LED tea candle. Cut its "flame" to get a maximum of light vertically up the tree.

As always I am including the OpenSCAD source file for you to adapt and/or improve:

• Install OpenSCAD from https://www.openscad.org
• Launch OpenSCAD and open the enclosed OpenSCAD source file (/File/Open).
• Amend the parameters at the top of the file or even amend the code.
• Save your changes (/File/Save).
• Render the design (/Design/Render).
• Export the rendered design e.g. as a .stl file (/File/Export/Export as STL).
• Slice and print.

See my other designs at
https://www.thingiverse.com/thinger13/designs