The first few layers of my prints always seem to underextrude (including the skirt). Please see the pictures. I have tried lowering the print speed, overextruding but nothing seems to improve the matter.
The underextrusion starts to improve after the first couple of layers but I've had a couple of prints where it simply stopped extruding after the 20th layer and the extruder kept moving as if it was actually printing.
Any idea on how to regulate the flow of the filament?
I figured out a few problems and now it works OK:
1) use new nozzle, the diameter must be unaltered ( exact size!)
2) measure the filament diameter always! and use correct value, this make a huge difference, I have many rolls and they vary extremely! up to 0.2mm !
an here some settings I use:
no cooling fan, I only get bad results when cooling, similar to your photo.
temperature, speed and layer thickness influence each other. try to find the right relation one to another. I find especially speed is a major factor, why I don't understand the HS, because high speed is impractical...( may work a bit faster for PLA, but nothing else)
I will probably limit myself to 2 brands: faberdashery is great! and colorfabb.
Is your problem solved?
i have the same problem as you
Thanks Marcel. Making the negative number 0 worked. I'll try the rest of the tips.
@marc that's a huge increase! how did you find that out? how long have you been using the nozzles for?
@marc do you mean the nozzles are larger than .35mm? What diameter did you use?
I increased the flow rate to 130% in Simplify3D in the Machine Control Panel. It has improved the results substantially but I'm still having problems where the flow is inconsistent. The extruder stopped extruding mid-way through the print (even though the nozzle kept moving according to the gcode). Also you can see gap lines in the print and one of them was large enough to break my unfinished print into two pieces just as I was removing it from the build plate.