I thought it was z wobble...
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@matt3o Thanks!
Is there any play in the extruder carriage bearing block or in the mounting of the X axis rail?
Are pulley and motor mounts solid? -
@mrehorstdmd said in I thought it was z wobble...:
@matt3o Thanks!
Is there any play in the extruder carriage bearing block or in the mounting of the X axis rail?
Are pulley and motor mounts solid?the extruder is mounted on hiwin rail+carriage and I'd say it's pretty solid. The pulleys are mounted on shoulder bolts secured on top and bottom.
The only thing I'm not sure about is the belt tension. It feels very tight on the short side (on the X connecting to the head) and slightly floppy on the long side (on the Y). It's a 400x400 printer. But I don't see any vertical banding... so I guess it's okay
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did you try swapping your nozzel?
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I tried to change filament and to set the extruder screw very tight. I didn't notice a huge improvement.
I'll try with a new nozzle in case the one I got was defective from factory.
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Is your bed PID tuned? Bang-bang on the bed can lead to some weird rhythmic warping.
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Try printing a 40mm cube in vase mode with no top or bottom layers and post a picture. Have a feeling there’s an issue with inconsistent extrusion.
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I set it PID and recalibrated, but same result @Phaedrux . I actually also tried without bed heating.
I also tried to change the nozzle with no improvement.
@mwolter I usually print 1-walled 50mm cube (no infill, no top), but not in vase mode. This way the result should be more reliable as you stop and restart at each layer. Does it make a difference?
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A vase mode print is often a good test since it focuses more on printer hardware because it doesn’t utilize retractions and eliminates retraction tuning as a possible issue. It also makes it very easy to see repeating patterns that would indicate an extruder issue.
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thanks for the heads up @mwolter
this is the cube in vase mode
this is the section
basically the same. super smooth on one side, wobbly on the other.
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Try increasing your extruder motor current or even try printing at a higher temperature.
You can get a similar repeating pattern if the nozzle builds up pressure that the extruder drive can't overcome. If your system is a bowden system, that could also have issues if the nozzle builds up pressure that the system can't overcome.
The nozzle pressure issue can look like a z-axis wobble problem when its not.
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Are all of printed in the center of the bed? Have you tried printing one at one of the corners/edges of the bed?
I've been struggling to figure out how you can possibly get such an asymmetry in the inside and outside walls when you have a clean nozzle that's parallel to the bed. The only thing I've been able to come up with is the possibility that there's a slight 'wobble' in the bed as it travels up Z, causing the vector orthogonal to the print plane to rotate around actual Z such that the nozzle is always 'tilted' slightly towards the outside of the box.
If that were the case, I would expect a box printed at one of the edges of the bed to show the pattern on the outside of the face closer to the edge of the bed and the inside of the face closer to the center.
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@PDBeal I'm direct drive but I'll try to pimp the motor current. I tried to print at various temperatures already but couldn't see much difference.
@whopping-pochard that's actually an interesting idea. Let me try that as well and I'll report back!
thank you all guys for your continued help!
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unfortunately I don't see any difference in printing in the corners... also giving more amps to the extruder doesn't seem to work...
(╯°□°）╯︵ ┻━┻
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┬─┬ノ(ಠ_ಠノ)
Can you show us some photos of the printer?
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@Phaedrux sure, I'll take some pics later. In the meantime I can show you the 3d model with a few details
