After getting some free time for designing my own CAD item, I decided to make a BMW keychain for my key ring for the 1968 BMW 2002.

Using TinkerCAD I laid out a simple design and exported the STL file.

Below is the start of my print.

The image below is the slicer program Repetier which converts the STL file into GCode that my 3D printer understands and controls the stepper motors.

Here is the final print.