I was aiming here for simplicity and ease in printing as well as just extending the simple design I already proved in the prior christmas tree model. That is, two mostly flat parts designed to easily fit together to form a three-dimensional look, and something easy to hang on a tree or stand up on a shelf.
|tiny version with filled parts|
The first version had filled-in circles, but in the final design, I hollowed out each circle to make it lighter and slightly more elegant (who am I to judge)... Ok, I really did that to make it print super fast ;)
To hollow out the circles, I used the "Shell" tool in 123D, but there are two tricks:
First, to get a thick enough shell, you might have to initially thicken the height of the object, as the modeling tool won't let you have a shell width that is greater than the height of the object (since it is also trying to shell the bottom).
Second, once you have the shell, to get rid of the bottom layer, you simply select that inner bottom face and "Pull" (actually, Push) that face in the negative direction beyond it's thickness and it will simply disappear.
Here is a link to the the model:
The Snowman - Three parts in total - two snowman parts and a stand.