01-08-2021, 07:26 PM
Meanwhile the grease arrived and after removing the old one I relubricated the spindle. Unfortunately that doesn't help.
After some more research I've read of a guy who had problems with jerky movement of the linear bearings caused by the factory grease.
Just to be safe, I disassembled the bearings, cleaned everything in IPA and relubricated them, but the problem still persists.
I played with the print settings, tried different resins, reinstalled the firmware and used a different slicer, but still no success.
Eventually i found the cause: my stupidity! and temperature fluctuation (but mainly the former)
Since I don't have a suitable place for the printer in the house, I have set up a corner for it in the garage. The garage is unheated, so I have installed a small 12V PTC heater to keep ~25° C in the build room. I kept the hysteresis at their default value of 2 degrees and since the heating element is not very powerful and need some time to heat up, the temperature drops even lower before it starts to rise again. It works flawlessly in the first few weeks, therefore I excluded it as cause of the problem.
But then the temperature outside drops about 10-15 degrees to ~0° C. At the same time the lines start to appear.
I guess as the temperature delta between inside and outside the build room is much higher now, the frequency of fluctuations inside increased and the effects became more visible.
To verify this theory I made a few test prints without the heating, but 2 of 4 prints failed (probably ~3-4° C garage the garage are a little too cold
).
Then I adjusted the hysteresis of the thermostat to 0.1 degrees and finally: the lines are gone!
I've printed 4 pieces since then, all without problems
Here are some pics of the same model before and after the adjustment:
After some more research I've read of a guy who had problems with jerky movement of the linear bearings caused by the factory grease.
Just to be safe, I disassembled the bearings, cleaned everything in IPA and relubricated them, but the problem still persists.
I played with the print settings, tried different resins, reinstalled the firmware and used a different slicer, but still no success.
Eventually i found the cause: my stupidity! and temperature fluctuation (but mainly the former)
Since I don't have a suitable place for the printer in the house, I have set up a corner for it in the garage. The garage is unheated, so I have installed a small 12V PTC heater to keep ~25° C in the build room. I kept the hysteresis at their default value of 2 degrees and since the heating element is not very powerful and need some time to heat up, the temperature drops even lower before it starts to rise again. It works flawlessly in the first few weeks, therefore I excluded it as cause of the problem.
But then the temperature outside drops about 10-15 degrees to ~0° C. At the same time the lines start to appear.
I guess as the temperature delta between inside and outside the build room is much higher now, the frequency of fluctuations inside increased and the effects became more visible.
To verify this theory I made a few test prints without the heating, but 2 of 4 prints failed (probably ~3-4° C garage the garage are a little too cold
).Then I adjusted the hysteresis of the thermostat to 0.1 degrees and finally: the lines are gone!
I've printed 4 pieces since then, all without problems
Here are some pics of the same model before and after the adjustment: