I am printing at .3 later height with a .4 nozzle.

I am printing at .3 later height with a .4 nozzle. If i wanted to print at say .1 layer height is it better/recommended to change the nozzle to a smaller diameter also?

Nah, large nozzle diameters should also have good overhang and bridging characteristics because of the wide nozzle.

So if i set layer height to .15 i should be extruding at .21?
.15 * 1.4 = .21. that means if i print a 1 wall box the wall should measure .21?

You shouldn’t need to be setting extrusion width…you’re not using skeinforge are you?

nope slic3r

Going into conf settings and choose .1 layer height from the drop down. The layer height setting to the right should say .1?

That’s it. (Oh, you’re using “basic mode”?)

Nope expert

So if i am using .1 layer height i should be extruding .14 for a single wall?

why are you asking? You shouldn’t have to set that… once you slice the model, it’ll tell you what a single wall width should be in the top comments of the gcode. Slic3r automatically determines what your wall width should be.

Is this not a way for checking the extrusion output as a calibration

Slice it as whatever layer height you want, open the gcode in a text editor; it’ll tell you what it’s calculated as the width at the top of the gcode file.

To confirm that number is the actual output do what?

I have better luck printing small layer heights with smaller nozzles, but certainly you can get down to 0.1mm with a 0.4 or even 0.5mm nozzle. If you are going to manually set your extrusion width, you probably don’t want to set it to too much less than the size of your nozzle diameter. Some folks will insist extrusion width must be larger than nozzle diameter, but the developer of KISSlicer says he’s achieved good results down to 1/2 the nozzle diameter. Letting Slic3r calculate “ideal” extrusion width for you is of course an option. Good to keep in mind that if you’re printing at very small layer heights relative to your nozzle diameter, you’ll probably have to adjust your bridging flow rate to get decent bridging.

If i am getting good prints at .3 and i transition from .3 to .1 do all the slic3r settings stay the same only the layer height is different

If you are letting it automatically calculate extrusion width, then yes, all the other settings can be left alone as a starting point. You’ll have to experiment with the subtleties however and may want to change anything from the temperature of your nozzle or bed to the amount of cooling used, travel speeds, bridging flow rate, etc.

Thank you @John_Davis and @ThantiK I am gunna do more prints and see what what i get.

I have tried Cura some but never really got the hang of it yet. I need to just use it some more and look for tutorials on YouTube. Thanks

Cura ,in my opinion, is the most intuitive way to print I’ve tried. Using slic3r and pronterface as well as repetier host for some reason always made my filament strip. I believe this was due to my retraction settings. Tried yarrh(yet another reprap host) too but I’ll recommend cura to anyone.

I also got my best results with cura. Even with a .4 nozzle.