How small a line can your printer produce?

I wanted to find the smallest line my printer could produce so I made this print produce every combination from .1x.1 to 1x1 in a 10cm x 10cm grid.
The y values increment along 1 side while the z values increment on the other.
Fidn the smallest one that you're happy with and then count the squares (in both directions) from the .1x.1 to determine it's size.