Underextrusion issues with speed!
Hi,
I have a issue which I have been unable to solve no matter what.
I use Prusa Slicer on my Hypercube Evolution since I have designed the machine.
The extrusion E steps and Flow rate have been perfectly calibrated and it prints wonderfully when I print at around 20-25 mm/s
The moment I double that speed to around 40 mm/s I face under extrusion issues only during the infill. The perimeter has no issues but the infill has underextrusion but that too not everywhere. Only in some random points it underextrudes.
So I kept all the speeds at the same of 40 mm/s but still no luck.
What is that I am going wrong with?
I am using the latest Marlin version 2.1 and it is being controlled via Octoprint running on a Raspberry Pi.
Help requested!!!
-Siddharth
RE: Underextrusion issues with speed!
Have you tried raising the nozzle temp?
RE: Underextrusion issues with speed!
Hi,
Yes. Raising the temperature has it's own problems.
The temp somehow gets into the lower end of the heat break and the filament starts getting jammed there! The fan for hotend works with high speed!
-Siddharth
RE: Underextrusion issues with speed!
Request help in this matter as I am unable to get a solution for this!
RE: Underextrusion issues with speed!
Sorry, I wish I had more ideas, but I'm not familiar with that printer at all. Can you increase the speed of your heartbreak fan?
Generally in my experience the infill is not printing good because infill prints much faster than then perimeters, which is why I suggested raising the nozzle temp. It's worked for me in the past. A good clue is when the filament starts to get a matte finish it means it's not getting hot enough in the hot end.
You could also set the speed for infill in the slicer, and if the perimeters print well then set the infill speed to the same as the perimeters.
Another option is to lower the volumetric flow rate in the filament settings to limit the maximum speed.
In Prusa slicer on the print preview window you can select in the legend to see print speed. There you can see at what speeds everything is printing. Keep lowering your volumetric flow until you see it printing at the speeds you want.
Other things to check might be to make sure your extruder gears are not slipping on the filament.