This is a 3D representation of a multiplication table: The higher the value, the higher the cube. Back to school with OpenSCAD / Customizer! I just had time for a short test print, and the numbers are good readable. TODO: -Print a full 10x10 copy! Update: 2013-08-22 Added a few more Options to customize even more! Update: 2013-09-03 Fixed a minor glitch in the script that lead to unprintable STL files.Print it out, highlight the numbers with something like a sharpie or a similar product (nail polish should also work).