Ugly walls
Of all my printers, Voron Trident, Bambulab P1S and the Core One, the Core One has the ugliest walls:
I have built a Voron and tuned it like crazy to make it print very good. But even de P1S prints better than the Core One.
It might just be a setting i'm overlooking. Already played with pressure/linear advance and extrusion rate. Printed slower/faster, retuned the belts, swapped nozzles. Also tried different filaments, PETG/PLA, different brand like Polymaker/Prusament/BambuLab/Kexcelled; all same ugly layers.
The leadscrews are perfectly straight, no wobble at all.
Any other ideas i can try?
RE: Ugly walls
Think i found it.
The last bend of the PTFE tube is too narrow. The filament doesn't go smooth into the extruder.
RE: Ugly walls
I think it did, just a bit, still not printing as good as my other printers though.
Did it get better?
RE: Ugly walls
Think i found it.
The last bend of the PTFE tube is too narrow. The filament doesn't go smooth into the extruder.
But the last bend of the PTFE tube is defined by that rigid, printed guide tube. How did you adjust the curvature? Did you remove that printed part?
RE: Ugly walls
I removed the printed part.
My top panel is raised already since i used the magnetic cover. Otherwise the ptfe will hit the top panel, i guess that's why the printed part is used.
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Still not happy with the results.
Thinking about sending it back.
Left Core One, Right P1S
I can feel the ridges with my finger.
RE: Ugly walls
Something seems wrong with your unit; walls look like your P1S example on my newly built Core One and on all the photos shared here by others. (At least regarding the layer-to-layer alignment; VFAs/belt ripple are somewhat common unfortunately.)
You mention that you have already swapped the nozzle. But could anything be wrong with the extruder? Have you looked inside? A couple of users reported nasty filament clogs at that printed part just above the hotend entrance. Or maybe a piece of debris somewhere in the planetary gears?
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I have taken a first look, no clog so far.
I have swapped nozzles a few times, i have 3 0.4 nozzles to test with. No luck so far.
I also did the gear alignment calibration again, took the cover off as well, just to be sure it's not that.
I'll contact support tomorrow.
RE: Ugly walls
walls look like your P1S example on my newly built Core One and on all the photos shared here by others.
Even if the OP have a big issue with its layers alignment, you can still distinguish the belt ripple on its part but a very slight VFA on the P1S. 😯
@rinkel maybe you could try to add a drop of sewing machine oil to your threaded rods. Prusa recommended to not until now, but some user faced to blockage issue with the Z axis on the CORE One. A backlash on a nut could lead to your kind of bad layer stacking. Excepted VFAs, you should be able to get very nice walls.
RE: Ugly walls
Thanks for the tip, i already put some ptfe grease on the leadscrews, did not help.
I'm now mailing with support and they're very helpful. I just dismantled, on their advise, the planetary gears to inspect. No luck so far, it all seems fine.
Will check the motorshaft tomorrow, but will need to make the motor turn, which i can do with the gears allignment calibration.
RE: Ugly walls
Try loosening the trapezoidal nuts on the bed. And then tighten them very lightly.
Looks very much like a jammed Z axle.
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Try loosening the trapezoidal nuts on the bed. And then tighten them very lightly.
Looks very much like a jammed Z axle.
I concur with Rainer's recommendation. If you have not done the above yet: It will ensure that the lead screws and nuts are in agreement with the smooth rods. (Which are defining the lateral bed position.)
Important: Do this adjustment with the bed in the bottom position!
RE: Ugly walls
I think i already tried this, but will give it another try. Thanks
RE: Ugly walls
Loosening the screws at the t-nuts did not help, unfortunately
RE: Ugly walls
i have the exactly same problem as you.. the support told me that maybe the printed parts on the z-motors are badly printed. he will give me some new one and he will chek up when the printed parts are available to printed by us self.
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That would mean the trapezoidal nuts are binding, or the bearings on the rods are not moving smoothly.
I just loosened all the screws, see if that improves.
Wonder if they collect similar issues...
RE: Ugly walls
Unfortunately that did not help.
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On the photo it looks like Core On print is few mm smaller than it should be. Can you print some test cube and check height? Squished print will have those ugly walls.
The cause may be friction of Z axis. I would start with lubrication of Z rods and trapezoidal screws. Some people had issues that bottom is not in level and does not level the bed properly. Move the bed up and manually it level against nozzle. Put something like credit card on the bed under the nozzle and turn trapezoidal screw until it touches the nozzle. At front left, front right and middle back.
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I printed around 10 xyz-cubes, they all seem to have correct measurements (z:20.08, y:19.99). But i will try your tip, it makes sense, manually level the bed. Maybe my printer is not perfectly built and the Z calibration will put the bed in wrong position.
Something new to try...
I also loosened the screws that holds the 2 front linear bearings. I hav experienced with other printers that if that is tightened too much it could cause is to grind.