JATMN wrote:Anyone with under extrusion issues. Please read.
It appears the bowden tube could have slipped out partly or might not have been seated properly when built. Even if it feels like its going all the way in.. double check that it goes at least to the PCB board (depth), Mine was stopping before the PCB.
When I disassembled the print head I found there was a blob of PLA balled up at the top of the Hotend which was stopping the Bowden tube from going down. It was easy to remove even with the head cold (it fell out even). But I noticed I still could not get the bowden down all the way when I assembled it.. It appears there might not be enough of a chamfer on the hotend to guide the tube in and it was stopping on top of it. To address this issue I guided the tube in with the head unassembled then carefully reassembled it while the tube was seated. (seriously need like 3 hands for this) you need to release pressure from the push lock on the bowden or you will just compress the bowden tube in the head and cause other issues.
After completing these steps my printer is now printing happily and completing prints again ^_^
So, here's something interesting....
Earlier this morning, I had printed a 3DBenchy. Except, I had scaled the size down to 75%, so it would print in 2 hours.
Once the print finished, I noticed some layering issues on the right-side pillar of the Engine-Room of the boat. At that time, I passed it off as a glitch.
Since then, I have updated the firmware to the latest on github.
I then re-calibrated, and printed a a 5mm calibration-cube print to make sure that all is well post firmware update. The print came out perfect, with no issues.
I then re-tried the 3DBenchy again (and I also regenerated the G-code), and printed it again (post-firmware update).
The new print has the signature of the same layering issue, at the exact same spot.
It's just shows up for a few layers, and only on this one portion of the part. No issues seen at the same layer level on the rest of the part.
Please see the attached picture. The print on the left is the new one from this after noon. The one on the right is from earlier in the morning.
If this is a potential bowden-tube not being seated properly issue, what are the odds that it will happen at the exact same spot on two different instances of the print, with a firmware update and another print in between.
Is it possible that NetFabb messed up something in this spot when I scaled it down? Or might it be the MC slicer, that is messing up the tool-paths for that spot, on the print.