Customizable measuring cups (OpenSCAD)

I need to make 2.5, 5, 10 and 15 tablespoon measurements regularly. Even the shortcuts to those measurements are tedious (e.g. 10T = 1/2C + 2T). I figured that my 3D printer and I ought to do something about that.

Those specific measurement sizes probably aren't very useful to anyone but me, but I have included the OpenSCAD file, so if you need another size and aren't afraid to use OpenSCAD, go for it. Instructions for creating a measuring cups in this style of your own size are in "How I Des