Hi, I'm a sighted person and I don't read braille (adequately, anyway), but I want to make 3D printed objects with braille labels. I'm just getting started in this, and my plan is to print some samples to have braille readers test. But I figured I would hit up reddit for some initial thoughts.

My questions are about the comfortable size ranges for reading braille. Is bigger always better? Putting aside the finding of a label on an object (a separate issue), are smaller dimensions fine for very short reading? Are there certain dimensions in braille that affect legibility more than others? Which dimensions can I play with and which ones shouldn't I?

From my research, the typical ranges of braille dimensions are:

1) Dot Base Diameter is 1.4 to 1.6 mm

2) Dot height is .5 to .9mm

3) Distance between two dots in the same cell is 2.3 to 2.5mm

4) Distance between corresponding dots in adjacent cells is 6.1 to 7.6mm

5) Distance between corresponding dots from one cell directly below is 10.0 to 10.2 mm

As an analogy from my own sighted reading, comfortable is 12 point font. 14 point is too big. 8 is fine for footnotes. Less than 6 is for important notices of medical side effects on prescription bottles that no one can or does read, but can work on coins, jewelry, game tokens and one word type situations. Different spacing between lines is flexible, but variable spacing between letters and words is not so flexible and can look really weird.

Aside from a "government standard" answer about braille, I want to know how actual braille readers feel. Every tenth of a millimeter makes a difference from a production standpoint, but I want dimensions that a braille reader would find comfortable and appropriate as well.