Quote Originally Posted by jfkansas View Post
It's really impractical to expect to extrude a .4 line with a .4 nozzle. There is a bit of smash which will always widen the line around 120 to 130%. Even the nozzle in free air purge is probably extruding about .5 or .6mm depending on the filament. Plastic tends to swell up after being squeezed down under heat and pressure.
Makes sense. I did measure a "string" of filament and it was about .52.