Underextrusion and transport problems of the filament
I have severe problems with printing a simple rectangular frame with a size of 190 x 190 x 50 mm. I tried the following steps, following the advices of the support https://help.prusa3d.com/article/under-extrusion-nextruder-printers_821253 :
1. Nozzle: replaced the nozzle and recalibrated the unit
2. Slicer settings: modified the slicer setting with regard to temperature (modifications in the range of 210 °C ... 230°C) and printing speed options
3. Gearbox: recalibrated the gearbox
4. Filament: Used new and different filaments Prusament Galaxy (black) and Gravitiy (grey)
Observations:
- Printing the first layer is good. The material sticks good to the plate
- After a while the filament extrusions is reduced or even the transport of the filament stops
- Noise can be heard from the extruder similar to a chattering, vibration.
Question:
Should I replace the idler leveler (A, B) or the extruder main plate. Is there any stepwise approach to find out the real root cause of the failure?
RE: Underextrusion and transport problems of the filament
What kind of filament are you using? Is it PLA? Seems maybe your filament is clogging the nozzle.
Without a picture of the issue we can't do much more than guess - but the first thing I would check from your description is the extruder idler pressure.
To clear any possible partial clog I would first do a cold-pull.
To reduce the effect of infill back pressure change to either cubic or gyroid infill and re-slice.
Print - it might now be fixed (unlikely) but if not tweak the extruder idler pressure, it could be out either way so keep careful count of the turns; I would begin with half a turn at a time, test printing in between. If that doesn't help undo all the turns, print again and show us a picture of the problem
Cheerio,
RE: Underextrusion and transport problems of the filament
I tested the setup with two different PLA Filaments The first one was Prusament Galaxy (black) and the second Gravitiy (grey). I had similar problems with PETG and a hotend temeparture of 245°. Clogging shouldn't be the problem. As written before I changed the nozzle and in addition the first layer priniting and some following layers is ok. In my opinion after appr. 30 - 60 min the underextrusion starts.
RE: Underextrusion and transport problems of the filament
Without a picture of the issue we can't do much more than guess - but the first thing I would check from your description is the extruder idler pressure.
To clear any possible partial clog I would first do a cold-pull.
To reduce the effect of infill back pressure change to either cubic or gyroid infill and re-slice.
Print - it might now be fixed (unlikely) but if not tweak the extruder idler pressure, it could be out either way so keep careful count of the turns; I would begin with half a turn at a time, test printing in between. If that doesn't help undo all the turns, print again and show us a picture of the problem
Cheerio,
Thank you for your advice. I will start the printing again and will take some pictures and publish them here in the forum.
Regarding your first proposal: I will clean the transport unit "idler leveler (A, B) or the extruder main plate" and adjacent parts of the extruder with pressurized air. One question: What do you mean with cold pull? Should I remove the nozzle and pull a cold filament through the transortation unit?
Change of infill: I already use gyroid infill but I will start printing again showing some pictures here.
Changing the idler perssure will be the next step after having finished the first proposal.
As I already mentioned before I will take some pictures to better explain the priniting results in dependence of the parameters and changes.
RE: Underextrusion and transport problems of the filament
@diem
How can I enclose some pictures. The add media button show any reaction.
RE: Underextrusion and transport problems of the filament
RE: Underextrusion and transport problems of the filament
https://help.prusa3d.com/article/cold-pull-31702-core-one-35702-core-one-l_930551
Cheerio,
RE: Underextrusion and transport problems of the filament
Thank you for advice. It's just the prposal made by the 24/7 Hotline. I will continue the discussion with the hotline and after having concluded the issue, I will summarize the findings here, hopefully soon.
The Hotline proposed so far to:
- change in the slicer the nozzle type
- to update the Firmare version
- to carry out the cold pull test
Thanks in advance for your helpfull comments
Bernd
I am not happy with the state of your build sheet but the filament is sticking so apart from a reminder to keep it clean I will assume it is not the cause.
The extruder gears are reasonably clean, while they are open I would blow out any dust - that chattering vibration may have been the gears grinding into stuck filament in which case there may be dust behind the gears.
The pictures are not clear but I don't see any damage around the opening where the filament runs into the top of the nextruder tube, correct me if I am wrong.
The galaxy filaments contain particles of glitter so are a little more likely than plain filament to display problems but again, I doubt the filament is the cause.
So: let's take a look at the file. Please save your project as a .3mf file
Files > Save Project as
Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.
Cheerio,
RE: Underextrusion and transport problems of the filament
First of, Thank You for your comprehensive comments and advices
I am not happy with the state of your build sheet but the filament is sticking so apart from a reminder to keep it clean I will assume it is not the cause.
Comment: I agree, at the beginning I cleaned the sheet with a not suited sponge. Therefore there are some scratches to be seen. But the first layer sticks good to the surface of the sheet
The extruder gears are reasonably clean, while they are open I would blow out any dust - that chattering vibration may have been the gears grinding into stuck filament in which case there may be dust behind the gears.
Comment: I cleaned this gear area and the filament transportation unit with pressurized air. So it should be clean now
The pictures are not clear but I don't see any damage around the opening where the filament runs into the top of the nextruder tube, correct me if I am wrong.
Comment: In my opinion the guidance of the filamnet is ok. There are two tubes / sections for guiding the filament along the transport wheel which looks nice. I'm not so sure about the mobility of the bearings, which press the filament onto the gear wheel/ transportation wheel.
The galaxy filaments contain particles of glitter so are a little more likely than plain filament to display problems but again, I doubt the filament is the cause.
Comment: I used two types of filament. Galaxy and Gravity. Both show the similar results.
So: let's take a look at the file. Please save your project as a .3mf file
Comment: Thank you for your support. Good proposal. I'll try to submit the .3mf File
Files > Save Project as
Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.
Cheerio,
Short information from the three chat sessions with the 24/7 chat:
- Change the nozzle type from HF to standard in the slicer: see included 3mf file
- Carry out a cold pull – Done
- Update the Firmware version – Done
- Check the idler spacers - Done (only short visual inspection with pictures)
- Cleaning of the filament transportation section - Done with pressurized air
Printing results after measures: No significant improvement, looks a little bit "nicer"
Open task: Replace the Hotend unit, spare part is on the way. I proposed to check the resistance of the thermistor and the heating resistor. But if the issure is time or temperature dependent, a static measurement won't give the right information.
Looking forward to your comments on the 3mf File
RE: Underextrusion and transport problems of the filament
@Diem
the file, which I attached disappeared - second trial
Zip the 3mf before posting.
Cheerio,
RE: Underextrusion and transport problems of the filament
I transformed the file into a Zip-File and added it via the "Select File" button. The submission of the original 3mF- File as well as the Zip- File seems to fail. Hopefully the next trial will be successful.
These are the two files which I tried to enclose into the post via the "File Select" button. Do you have any advice, which option I can try to succeed.
The 3D Modell appr (190 x 190 x 50 mm), which I tried to print ist shown in the following picture:
