Underextrusion while the printer is calibrated perfectly?
Posted by Ohmarinus
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Underextrusion while the printer is calibrated perfectly? July 28, 2020 03:42AM |
As the title says, I have been playing with my Delta printer for a week now since I fixed it. Started printing with 7-year old filament and it worked perfectly. After calibrating a bit.
Now, I finished the roll and started printing with new filament from FormFutura, white PLA. I have done every calibration step possible but it will under extrude and sometimes even seem to be clogged. I have tested every part of the machine from:
- E-steps/mm which is spot on
- Flowrate calibration for correct nozzle thickness (0.4mm nozzle) and set it to expect a 0.41mm nozzle as described in the thingiverse page: [www.thingiverse.com]
- Tried out different temperatures down from 205ºC up to 220ºC
- Checked if the filament somehow has a higher friction coefficient? (tested feeding it through the PTFE tube and the hotend manually)
- Measured the filament thickness which is spot on, also measured it over a distance, there is absolutely no variation in thickness
- Checked the nozzle size (was it really 0.4mm or did I make a mistake when installing it) and yeah it's really the 0.4mm nozzle
- Tried a bunch of cold and semi-warm pulls to see if there was any blockage in the hotend, nothing. I could see straight through
- I store the filaments in a metal vat that is meant to keep safe chemicals, it has a lid with a silicone seal and I keep desiccant in the vat to pull out any possible moisture that gets in through the air when opening/closing it
- Printing at 0.2mm layer height so that also can't be the problem
The only thing left to do is try a different extruder, but I'm kind of lost as the extruder doesn't seem to be skipping steps or losing grip on the filament. The new extruder I have laying around for the machine in fact is better so I'm going to upgrade it anyway, but I am lost for words on this one. The same happens on my other printer when I use this filament.
What bothers me is that this is quality filament so I do not suspect it to be wrong. The parts that I print come out wrong, the flowrate test object comes out perfectly. The lines that are laid down do not touch.
Raising the temperature did help a little bit, but still, it's very clear in for example the first layer as you can see here:
It lays down the shell perfectly, but the infill looks blobby and distorted and the top layer isn't filled in correctly:
Anyone has any idea what it could be?
Edit:
After upgrading the extruder and re-calibrating everything getting again perfect results on flow and extrusion settings. I set out to print another new part and again, the same issue arises:
Mind you, this is not an error of the first layer calibration. This problem persists throughout the entire print.
Edit 2:
Raising the temperature even more and lowering print speed from 80mm/s to 70mm/s has improved the gaps slightly. However, I'm going to try a new print after the current one with Line Width set to 0.385mm instead of 0.4mm as suggested in here:
[community.ultimaker.com]
Edited 4 time(s). Last edit at 07/28/2020 07:32AM by Ohmarinus.
http://www.marinusdebeer.nl/
Now, I finished the roll and started printing with new filament from FormFutura, white PLA. I have done every calibration step possible but it will under extrude and sometimes even seem to be clogged. I have tested every part of the machine from:
- E-steps/mm which is spot on
- Flowrate calibration for correct nozzle thickness (0.4mm nozzle) and set it to expect a 0.41mm nozzle as described in the thingiverse page: [www.thingiverse.com]
- Tried out different temperatures down from 205ºC up to 220ºC
- Checked if the filament somehow has a higher friction coefficient? (tested feeding it through the PTFE tube and the hotend manually)
- Measured the filament thickness which is spot on, also measured it over a distance, there is absolutely no variation in thickness
- Checked the nozzle size (was it really 0.4mm or did I make a mistake when installing it) and yeah it's really the 0.4mm nozzle
- Tried a bunch of cold and semi-warm pulls to see if there was any blockage in the hotend, nothing. I could see straight through
- I store the filaments in a metal vat that is meant to keep safe chemicals, it has a lid with a silicone seal and I keep desiccant in the vat to pull out any possible moisture that gets in through the air when opening/closing it
- Printing at 0.2mm layer height so that also can't be the problem
The only thing left to do is try a different extruder, but I'm kind of lost as the extruder doesn't seem to be skipping steps or losing grip on the filament. The new extruder I have laying around for the machine in fact is better so I'm going to upgrade it anyway, but I am lost for words on this one. The same happens on my other printer when I use this filament.
What bothers me is that this is quality filament so I do not suspect it to be wrong. The parts that I print come out wrong, the flowrate test object comes out perfectly. The lines that are laid down do not touch.
Raising the temperature did help a little bit, but still, it's very clear in for example the first layer as you can see here:
It lays down the shell perfectly, but the infill looks blobby and distorted and the top layer isn't filled in correctly:
Anyone has any idea what it could be?
Edit:
After upgrading the extruder and re-calibrating everything getting again perfect results on flow and extrusion settings. I set out to print another new part and again, the same issue arises:
Mind you, this is not an error of the first layer calibration. This problem persists throughout the entire print.
Edit 2:
Raising the temperature even more and lowering print speed from 80mm/s to 70mm/s has improved the gaps slightly. However, I'm going to try a new print after the current one with Line Width set to 0.385mm instead of 0.4mm as suggested in here:
[community.ultimaker.com]
Edited 4 time(s). Last edit at 07/28/2020 07:32AM by Ohmarinus.
http://www.marinusdebeer.nl/
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