Nozzle size and layer width

If the Nozzle’s hole’s Diameter size is .35 and the filament directly pushes outward with no obstructions or offset, how do you come up with a layer width, say" .14 ". I have seen profiles from Cura, that have top layers at smaller layer widths than the diameter of the ejectomentor of the extruder. Terpsichorean that is.

1.Is it squished or combed across the surface to achieve a smaller or larger width?
2. If so how do you maintain a solid layer height?
3. Is it an ooze approximation, filament/volume estimation? Extra Flow specification?

Thanks Grem

The obstruction in this case is the bed or the surface of the layer you are printing the new layer onto. The nozzle width remains a constant, but height of the nozzle aparature from the print surface determines how much melted plastic can flow. Think of it like covering a part of a water hose with your thumb. In case of a .35mm nozzle you are extruding around 1/3rd of the theoretical available flow which makes fir overall thinner layers. Thinner layers mean higher detail generally, but 3 times longer print times at .14mm height.

If your nozzle is .35 (BTW that would be ID, the OD is nonexistent since the nozzle is conical), you’d probably want the layer width to be 100 -120% of the nozzle opening. A layer width less than the nozzle opening won’t be accurate. You can put those parameters into the slicer, but it probably won’t happen in reality.

Take a tube of toothpaste, put it open end down on the sink… Squeeze and pull. Measure the width and compare to the diameter of the nozzle. Should be about the same or slightly larger. Then try again, kwwping same height and speed of the pull the same as befor, but add more pressure to thr tube. Width will be “squashed” into the sink and most likely greater than the nozzle diameter. The only want to get a layer width less than the nozzle opening would be to angle the nozzle and drag a bead of toothpaste…

Thank you gentlemen!

This gives me an idea for a new Inventor project.