The first part of the quadcopter in 3D.

After some research I found several people who have 3D printers. I also discovered that there are sites that print the parts if we uploading the file with the 3D model and then send them by regular mail after printed. In many sites, you can also choose the material we want that our parts be printed.

Figure 1

I tried three 3D modeling tools available for Linux, Blender, Wings 3D and OpenSCAD. I found that the Blender is a complex tool but at the same time powerful, but requires a lot of learning for a beginner. Wings 3D is very easy to use but it is very difficult when you have to make the so called Boolean operations, ie, unions, subtractions and intersections. Finally, the OpenSCAD, is not a tool so much known, but it is a tool that does just the job I wanted to do, that is to make a 3D model for printing. The OpenSCAD uses a very simple scripting language for creating 3D models of parts. An example can be seen in Figure 1.

Figure 2

In Figure 2 we can observe the same part shown in Figure 1 with some minor differences, but made using the Wings 3D. An interesting use of the various tools is to use OpenSCAD to create the initial 3D model and then refines it with more detail using the Wings 3D or the Blender.
Another problem we have keep in mind when modeling the parts to print is to make a support for the parts if, the parts does not have a base for maintaining the equilibrium, to ensure that the parts does not move while being printed.