Over Extruding Center of Walls

Thanks for the response. What leads you to believe I am under-extruding? For the image I included of my own print (the pink one) I believe I was over extruding. The print was with all of Slic3rs default settings except the filament and nozzle diameter.

Since this print, I have printed half a dozen Benchy's. My belief is that I was over-extruding because of the issue I posted about, as well as marks on the top fill from my nozzle dragging through it. I changed only the extrusion multiplier to 0.9, then 0.8, then 0.7 before noticing major gaps between the toolpath on the "deck" of the Benchy. Looking back, I can see small gaps in the 0.8 extrusion multiplier print as well. I am currently printing at 0.85, but I still see small gaps. I think 0.9 is what I need to be using for extrusion multiplier.

As for my issue though, I completely believe the solution is between the extrusion widths page and possibly the number of vertical shells, This is where I have been toying around, but with very little success. My best results so far have been seen by reducing the widths to 0.4, but from what I am reading, it is not advised to use an extrusion width lower than about 120% of the nozzle diameter, so I'm kind of confused there. Do you have a suggestion for settings to use here for a 0.4mm nozzle?

Since wardjr is busy, I will chime in here...

1. have you calibrated your extruder steps/mm? this is where you start. If you ask for 100mms of filament to be fed in, you need to get 100mms of filament... for more info, read this: http://northwoods3d.weebly.com/blog/fil … ion-part-1

2. Have you calibrated your filament? average diameter, etc?
No two spools of filament will be the same, and it is very rare to have one that is exactly 1.75mm in diameter. For a slicing program to produce accurate results, it needs accurate information. Also, the extrusion multiplier should be calculated for a given spool of filament - not randomly changed. For more information on this aspect, see here: http://northwoods3d.weebly.com/blog/-fl … coming-out

Good calibration routines are essential to producing good prints.

It will be easier to start by inputting any known value available.  Otherwise you'll be chasing your tail with a bunch of best guesses.  In your picture you are over extruding, I was thinking you were under extruding based on one of your comments of reducing the multiplier till you had holes in the perimeters.  It didn't help that I then confused the two photos you had posted.  In that other persons picture there is some form of mechanical slop in the system.

In your picture you have general over extrusion.  If when you decrease the multiplier to get nice perimeters and infill, you get spaces between the lines on a bottom layer.  This is where you can decrease the extrusion width to close that gap without messing up your calibration.  You can also change extrusion width of infill patterns to achieve nicer surfaces.  This is especially important on 100% infill parts.
I can assume you have a .4 nozzle so this means your general extrusion width will be .48.  I like to use a first layer extrusion width of .36.  Then I set perimeters to .48. Infill widths can range based on what filament and the type of part I am printing but (.44-.52)

I am not certain what "line" you are referring to.  But if it's the space between the outer perimeters,  that's the "infill" section.  Remember that a Slicer is working in multiples of .48 in the X,Y axis.  If a particular area of a print is 2mm wide and you have selected 2 perimeters.  The Slicer is going to create tool paths to fulfill the perimeters first.  This will give 4 lines that add up to 1.92mm.  The Slicer then has to make some assumptions about the remaining .08mm.  If you have selected zero infill it's not a problem as it will just leave a gap between the two sets of perimeters.  If you selected 100% infill it's going to struggle to fill that tiny gap without over extruding.  This is where tweaking that infill extrusion width can come in handy.

Has anyone else seen issues with different versions of Slic3r as seen in the post linked below? This seems to be another example of the issue I am having with the resolution being to not use the most current release of the software. I will see if I can give a different version of Slic3r a try. Currently using the latest Linux build.

http://forums.reprap.org/read.php?262,549909

I have found on more than one occasion newest in terms of software is not the best.  If it works,  don't fix it and don't update it. With Cura I still prefer the old 10.3 over any other. I have now moved to Simplify3d and it is the only software I use now. But it is not free.

I use version 1.2.9 with no problems - but then I have properly calibrated my steps/mm and have set specific extrusion widths in the advanced tab, so the "bug" is not a problem for me

fudging numbers just doesn't work. If you want to solve your extrusion problems - do it right.

"Anything worth doing, is worth doing right"