Felix gives a basic introduction to 3D design in a Linux environment using a tool called FreeCAD. FreeCAD is a multi-platform parametric 3D modeling program that supports many 3D formats. The program is currently under heavy development and has not even reached release version one. FreeCAD is a great program but it is not stable or reliable enough for production environments. What type of 3D modeling software do you use? Let us know in the comments below!