I made a small hole in Joel Tellings design (http://www.thingiverse.com/thing:1323005) and sized it down to 60mm so it fits to my keyholder. Thanks Joel (3D Printing Nerd) for this nice design.
- Printer: Da Vinci 1.0a with E3D V6 hotend
- Rafts: No
- Supports: No
- Resolution: 0.2 mm
- Infill: 15 %
You can add pauses (M0) into the gcode to switch colors.