Technical question, important for design ( I understand this is somewhat variable with head temperature , speed and material ):

when you print a line, of a given layer height, how wide is it? THis is extremely important, for example, if you want a strong thin wall, you want the print lines smashed up against each other to get nice lateral fusion and set the wall thickness to an integral number of line thicknesses.

Also important, how wide does slic3r think the print lines are?

For example, how wide are the lines with PLA printing to a layer height of 0.3mm, at 210 degreees set at speed of 60?