How small can text print?

The soap stamp thing has been doing well. Someone wanted some text in a 10 point Times New Roman font on their stamp and I knew that wouldn't work, but I didn't know what point font Times New Roman would work. So I decided to do some tests and make something to make the point. At the top is 8 point, then 10, then 12, then 14. At 16 it becomes... readable, kinda. At 20 it's better. I'm guessing 22 will be reliable and 24 will be even better. (Not that I couldn't tell that just by looking at the wall thickness, but it's good to have a visual.)

This is based on the measurement that 1 point = 0.37594 mm. This is also based on MakerWare which does an excellent job with text, better than Skienforge did.