Remember to use high-quality filament which isn't toxic.
How to slice:
- Download Cura from http://software.ultimaker.com
Layer height: 0.2
Wall thickness: 0.8
Fill density: 20% (for the holder of the cutter)
For simple shapes I've activated the wonderful spiral print mode in expert settings named "Joris" (to credit Joris van Tubergen (http://www.thingiverse.com/joris) for this simple, yet powerful idea)