This is a simple SCAD file that generates round coaster. Various sizes are included. To create a custom one:

1. Open the ParametricCoaster.scad file with openScad ( http://www.openscad.org/ )
2. Modify the variables outerDiameter, bottomTickness, flangeHeight and flangeTickness to suit your needs.
3. Press [F5] and then [F6] to generate the cover.
4. Export it as a STL file
5. Slice it using your favorite software and print it!

Support material is not required.

This object main web page is: http://www.ctheroux.com/parametric-drink-coaster/.