What is that reason, you ask? Uh... because we really need more useless holiday decorations and tree ornaments.
On a whim, I started drawing a simple tree in Autodesk 123D Design - and while I had very low expectations, the resulting model and basic idea that came out really was quite nice!
I was looking mostly to create a flat ornament - something that could be hung from a wreath or a tree.
Within the first couple of minutes, once I had the basic shape down, I realized I could create two flat models and put them together at 90 degrees to create more of a 3D model - similar to something you could make out of cardboard.
It seemed also very feasible to create something that could stand on its own, so I also decided that this design should have a stand or something at the base that would allow it to be stood on a mantle or desk.
It was quite simple to sketch the basic tree. Using a common "stacked triangle" design, I did this with straight lines, freehand with the polyline tool, and sketched half the tree. Once that was done, I extruded it 2mm, duplicated that shape and flipped it 180 degrees and put the two halves close together (not touching) to form the tree.
Then I duplicated the whole tree shape with the rectangle, but in this duplicate, I shifted the rectangle to the bottom half so that this would exactly compliment the first object when the two were fit together at a right angle. The gap left between the tree halves was 2.7mm, which gave 0.7mm of clearance over the 2mm thickness of the objects to allow for printing imperfections.
I created a simple loop at the top using a 2mm high cylinder of 4mm diameter and removed a 2mm cylinder from the center to make the hole from which the ornament could be hung.
Adjustments to the model
I made one simple adjustment to make the model print faster and to give it a lighter design which would allow for more crafty decorations to be added (say string, garland, maybe even 3D Doodling in multi-color). I made all the triangle shaped branches hollow, so the whole tree was more of an outline rather than a solid shape. I liked this adjustment more than the original and kept it.
The Tree Stand
I decided to plan for the future and leave small holes in the bottom of the tree stand and a wire channel along the bottom so that I could eventually add tree lights if I found the ambition for that ;)
Expanding The Idea
Get the model of this Tree at this link - and be sure to comment here if you have any ideas for improvement!