Thanks for your response.
So that setting is a bit weird.
I set line width to 0.4
Infill line width to 0.8
and infill line multiplier to 3
so I have 3 infill lines next to each other
Now the overall width of infill lines in printed part is around 2.2mm (should be 2.4mm) but that's a reasonable error.
Weird thing is that the middle line is still thinner at around 0.4 mm thickness but the lines on the side are closer to 0.8.
So probably a tunable issue, but don't want to deep dive in to that at the moment.
A lot goes on in that little rectangle below the nozzle.
Line Width means different things in different situations. Most people think of Line Width as the width of an extrusion under the nozzle...a rectangle that is "Line Width Wide" X "Layer Height Tall".
Line Width is actually the index distance between two adjacent extrusions. That results in a rectangle that is indeed Line Width wide by Layer Height tall. When there is no adjacent extrusion (like with your infill), then the single extrusion is un-confined on either side. The width of the extrusion is then a function of print speed, the calculated flow, plasticity of the material, print temperature, and (dependent on the flow rate) maybe some other things like turbulence in the nozzle and the cooling effect of the flowing plastic on the hot end. This is in fact the problem I have with "Single Wall Calibration Cubes" but in your case they may actually be of some use.
Getting a single wall to be a specific width is usually a matter of flow (as in volume of filament/mm of extrusion/second). The final shape of the unconfined "Rectangle" (and consequently the width of the extrusion) is not the same as an extrusion that is confined on one side.
My Ender 3 Pro prints large models pretty good up to about 12mm³/sec. With a .4 nozzle at .4 line width and .2 layer height that occurs at 150mm/sec print speed.
If I was to double the line width then each extrusion would require double the plastic. I would need to cut the print speed in half in order for the extruder to keep up.
I would never advise to run any Line Width beyond about 1.25 X the nozzle diameter. The velocity of the plastic coming out of the nozzle goes a lot higher and it's tougher to control how that plastic is going to spread. In essence - if you want to print at .8 line width then put in a bigger nozzle.
Link to post
Share on other sites