Stereographic projection maze - prototype

It's actually the front of [Stereographic projection maze](http://www.thingiverse.com/thing:2013536). If you use it to project, it's not as accurate as [Stereographic projection maze](http://www.thingiverse.com/thing:2013536). The reason is this prototype just connects two points to form a line with some modifications of the line thickness. Besides, the generated model of this prototype looks weird if you specify a small maze size, such as the [stereographic_maze2_5x5.stl](http://www.thingiverse