Wrong calculation of E-parameter values Hello dear Community,
I am trying to print my first Box and I have a problem with the skin of the bottom layers.
After finishing the slicing and while looking into the generated G-code I was wondering why Slic3r increases the E-parameter continuously when 90 % of the lines have the same length and the axis have the same speed. Logically as long as the length of the lines are equal and the speed of the axis is also fixed so the amount of extraction has to be in this case also fix but that is unfortunately not the case.  Therefore as you can see in the Result photo, that the printer prints the skin layer at the beginning in the right way with the right amount of extruded material. At the end of the skin layer, it seemed very bad because of the huge amount of extruded material.
Some Infos about my Printer may be interesting for you :
Nozzle diameter = 2.7 mm
Type of Filament= granules
Diameter of filament = 2.5 mm
Please let me know your suggestions and feedbacks.
The value you see is the cumulative extrusion, in other words the E value in consecutive G-code commands reflect a position of the filament since you started that print.
It is normal that it continuously increases in &quot;absolute&quot; mode.
You should see, at the beginning of the G-code, also a M82 or G90 command, which means &quot;absolute extrusion&quot;. And you should avoid having M83 or G91 later in G-code, which would change an interpretation of E values to &quot;relative extrusion&quot;.
It is more accurate than relative extrusion (which is the mode you are thinking about).
From your print it looks like the printing bed is not properly tuned, probably too far.
Also, it is difficult to see properly, but it looks like you get bubbles in the second part of the print, which are the reason there is an increase of extrusion: hot air pushes too much filament out.
Maybe your granules are not properly dry. It is difficult to tell you more, pellet extruders are more difficult to tune than filament extruders.