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10-04-2018, 03:13 PM #1
- Join Date
- Sep 2016
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- 15
FF Finder - Print quality suddenly worse after failed print
A few weeks ago I was doing a large print wich failed halfway trough as the printer stoped extruding. The print had bad surface finish and a lot of stringing, problems I have not experienced before.
After cleaning the nozzle it was extruding again and I could print, but the surface quality on vertical surfaces was not as good as before. I tried cleaning the nozzle again, but no change. I concluded the nozzle was probably worn out or gunked up with something I couldn't get out, so I replaced it with a new Prima Creator nozzle. This had no detectable effect on the print quality.
I have also cleaned the gear and idler in the extruder and switched to a new spool of filament. Still no detectable effect on the print quality. (I also cleaned and lubricated bearing all rods and Z-axis lead screw, not surprisingly, no effect.)
One of the test prints was printed from the printers memory before and after the problem started, so I can rule out slicer settings.
Any ideas what could be causing this? Maybe the PTFE tube or some other part of the extruder?
Before_after_microscope.jpgBefore-after_1.jpgFirst_print_to_fail.jpgFirst_print_to_fail_outside_detail.jpg
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10-06-2018, 02:21 PM #2
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- Sep 2016
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- 15
I tried one more thing: I suspected the problem might have something to do with print temperature, but printing at 210 and 230 degrees resulted in prints identical to those printed at 220. (Using Flashforge PLA).
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10-07-2018, 06:51 AM #3
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- Sep 2016
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- 15
I noticed my pictures got scaled down enough to make it hard to see the problem clearly, so I have uploaded higher resolution images:
Under microscope, notice "bubbles".
Before and after
First print to fail 1
First print to fail 2
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10-18-2018, 09:50 AM #4
- Join Date
- Sep 2016
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- 15
To summarize there are two problems:
1. Uneven layers, similar to Z-wobble, except it's random, not regular.
2. Small "blobs", which I think are typical of wet filament, but I have tried with known dry filament (PLA and PETG) and got the same result.
Since my last post I have replaced the nozzle and PTFE tube. This resultet in no difference in print quality.
Any suggestions?
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10-22-2018, 09:44 AM #5
well on the before print it looks like you are starting all layers from the same point - hence the z 'ridge'.
in the after looks more like random start points.
Also possible retraction between layers might have been switched off. That could cause the same issue.
Design not printing solid
09-17-2024, 06:12 AM in 3D Modeling, Design, Scanners