I Roll 20's
thingiverse
The OpenSCAD challenge post features an icosahedron design that required just a few lines of code, but utilized two libraries. Though not 100% parametric, it's close to being so with some minor formula adjustments. The creation was inspired by WilliamAAdams's Platonic Solids and Tony Buser's Bitmap module. An update includes options for fantasy fonts, all generated using text2surface.py, and an elvish option. The design has been positioned for printing. Check it out at http://www.makerbot.com/blog/2011/09/29/openscad-challenge-regular-icosahedron/.
With this file you will be able to print I Roll 20's with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on I Roll 20's.