z seam gaps #15279
Comments
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Thanks for the report. |
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Hi, I'm attaching a project file where I had the exact same issue, I hope it helps |
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I use whatever partial roll I have laying around for these little test prints and today it happened to be PETG. The changes I made to the file were to accommodate the material: Hot End Temperature and Bed Temperature. My printer is an Ender 3 Pro and so to accommodate the bowden setup I changed the Retract Distance to 6.0. This is a shot from the back side showing the Z-Seam. I don't see any gaps like you are showing in your prints. So I'm unable to reproduce the problem. Coasting is off so that isn't it. Have you checked your extruder to make sure everything is tight, and that there is sufficient spring pressure on the filament? Your retraction distance of 0.6 tells me you have a direct drive. Maybe there is an issue within the hot end? |
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Hi. Thanks for checking on this. It is weird that the issue is repeating in both my printers and not in yours but it could also make sense since I do a fair amount of TPU and PLA and I change the extruder tension regularly. I do have direct drives in both of them. I would say that after your test my problem is not coming from CURA but from somewhere else in my printer so I will have a look on that. You can close the issue if you consider it finished :) |
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I'm going to go ahead and close this. We can always re-open it. My thinking is that I just haven't seen this behavior either in my own prints or in any other bug reports (although yours could be just the first in what will be an avalanche...ya never know.) |
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I am having this same issue! I was fine until i updated to 5.3.1 |
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@lvanek23 we will need a project file to re-open. |
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Hi. After this ticked was closed I kept having the issue but I just guessed it was my extruder, although it was quite well calibrated in my 2 machines. In order to keep printing those single walls items I started to use the options "outer wall wipe distance" and "retraction extra prime amount", being this last one the one that has given me the best results, although I currently use both. All that said, as soon as I go back to 0 on "retraction extra prime amount" my prints start failing again right away. |
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@rafaelmontserrat I was going to revisit this but the DownLoad Link has expired and I had deleted the original project file. If you and @lvanek23 could provide new project files I'll take another look. |
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I will provide later today project files with my current working settings and with a couple things disabled that brings my prints to "old" (when i opened this ticket) quality. |
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I re-ran e-step, resonance, and pressure advance calibration yesterday to rule those out, all were spot on needing no changes. I woke up and decided to get froggy, turned retractions off altogether, still have a z seam gap. :(
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This is from yesterday. Even with the outer wall wipe distance and retraction extra prime amount settings activated it managed to fail, so I guess is a good test. Attached an STL as well. This profile has been working perfectly fine on my KP3S and I use a similar one on my SV06, just the extra prime amount is set to 0,216mm3 because I have a 0.6mm nozzle. As soon as I turn off that extra prime amount in both of my printers all my parts (single wall) start to show gaps in the Z seam. I've seem quite some people already complaining about this CURA version Z seam alignment and so on so something else might be happening regarding this...
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Im getting some gaps but i think its due the wall order printing. I actually use a lot the 5.3.0 alpha+xmas due the new tree support, but for some reason I'm using 5.3.1 now. The gaps are present after the update. because 5.3.1 print all the inside walls first then use a lot of unnecessary travels to print the outside leaving some gaps at the begining of every outer wall. 2 videos the same piece, differences between 5.3.0 alpha+xmas vs 5.3.1 5.3.0.alpha.xmas.mp45.3.1.mp4 |
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I also have the same issue (petg, 0.6 nozzle&line, orbiter v2) in 5.3.1 and 5.4.0-beta.1 :( |
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Without project files this is impossible to chase down. I don't get the problem with my printer so I can't troubleshoot here. |
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cilinder 5_3_0_alpha_xmas.zip The problem itself is lack of calibration, but slicer used to mitigate it optimizing wall order printing. |
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I've tried LA on/off, Outer Line Wipe Distance
PS: 5.4.0-beta.1 |
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1 mm retraction and Outer Line Wipe Distance
PS: 5.4.0-beta.1 |
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Alright, some progress. I know my printer. The chance of this being a mechanical problem is very low. So this does seem to be a Cura problem. @MariMakes here is a gcode of that print. I did take a look at the flow settings and once again I don't see anything odd. It doesn't print well though. |
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Hey guys, im having the same issue My printer is an ender 3 running Klipper and 0.4mm nozzle. It has an upgraded hot end and direct drive extruder. Im also using Cura 5.3. I've been printing cylinders with 2 walls to test out different settings and try to solve this, and I found some interesting results. This is what I started with: Firstly, I discovered that lowering my speed from 120mm/s to 20mm/s resulted in a big reduction in the z seam gap. The seam came out almost perfect. After this, I tested pressure advance at my normal speeds, and found that while it was off, the z seam gap mostly disappeared. I ran the tuning tower command on a 2 walled cylinder, and as you can see, more pressure advance caused more z seam gap. Im not really sure what to do now, as pressure advance is vital to maintaining good print quality at the speeds in which im trying to print. It's interesting that linear advance did not have the same affect for you guys. Maybe the firmware has something to do with it (Marlin vs Klipper)? Hopefully we can solve this! Here are the settings that didn't make much difference: |
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Part of this may related to Klipper. There is some work being done by the Cura team to better integrate Cura and Klipper but after reading a few of the bug reports regarding blobbing and Klipper it appears to be an involved process. |
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@GregValiant is right, In the 5.5 Beta release we introduced Enable Fluid Motion, Fluid Motion Shift Distance, Fluid Motions Small Distance, and Fluid Motion Angle which are settings for printers with smooth motion planners like Klipper. I don't believe they will help with the zseam but show that we want to learn more about how we can improve without having access to Klipper printers ourselves. So if you know how to help us be better, we are willing to listen. |
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Came across this issue because I was struggling with a similar one. One thing though I noticed. I can see the gap in the Cura preview (5.4.0).
Trying to see if there is a setting that fixes things, but I thought I'd mention it here. -edit- Ok. Looked at the color scheme, white color defines the start.... |
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@geonosys01 you are severely under-extruding. Here is a close up of your model. Those gaps shouldn't be there.
I would suggest you calibrate the E-steps on the printer and also check your hot end for a blockage at the bottom of the bowden tube (where it meets the nozzle) or maybe a partially clogged nozzle. Here is your model printed with silky gold (that's been laying around for a while) on my Ender 3 Pro. I was too lazy to change nozzles so this is with a 0.4 at .2 layer height and .4 line width. |
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Thanks for taking the time to respond (and print). My shrink also says I have other problems :)
I agree there is an underextrusion issue I need to address, but I've been printing lots and lots of things (with same filament, same settings) and only these are giving me these issues. |
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"...but I've been printing lots and lots of things..." I've been the greeter here for a couple of years now. I have a few tools I use to analyze gcode files and this sort of problem with the gap at the Z-seam has not (to date) been in any gcode I've looked at. |
Don't worry, they're getting enough TLC :) "I've been the greeter here for a couple of years now. I have a few tools I use to analyze gcode files and this sort of problem with the gap at the Z-seam has not (to date) been in any gcode I've looked at." I'm curious about the tools you use. Are these publicly available or is it something you put together yourself? |
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Ok, re-calibrated the lot and still had the issue. Upon further investigation I cam across the arachne engine and more people having similar issues.
Now the results are as I would expect them. |
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Your results are better. The print I did was with 5.5.0 so Arachne was enabled. I haven't had any problem with it myself. It's different mostly because there are additional settings to pay attention to. |
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Hm. |
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Other than changing the nozzle size (too lazy to put in a 0.6) I sliced mine with your settings. Line width and layer height were different, but they were not far off from my own. I printed it at 75mm/sec so the flow rate was about 6.3mm³/sec. Did you happen to try slicing that in PrusaSlicer? It has a switch and you can turn Arachne off. That allows you to check both ways. |
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I removed my gaps by calibrating and upping Outer Wall Wipe Distance to a larger value like 1-2mm. Tuning linear/pressure advance, flow, and esteps is important too. It mostly was a problem for me on curved surfaces with a travel move directly after the seam. Those travels happen more newer Cura versions due to the new variable line width simplifying inner walls. Now, on single walled objects, wipe goes in the wrong direction. I am reporting that bug today. |
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this is My GCode, i found the extruder did not work at the first point "G0 F18000 X164.61 Y193.023 Z1.4",which close to End point(X165,Y698,189.905). |
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@yhd343762 please zip and attach the full gcode file so I can analyze it. What Cura version did you use? The current version is 5.7.1 and I haven't heard of any problems with Z-seam gaps since 5.4. The "G0 F18000 X164.61 Y193.023 Z1.4" line is simply a travel move going up to the start of the next layer (plus your Z-hop height of 0.40). I'll need to see what is happening prior to that. |
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hi，
I use cura 5.6. This is my gcode file, it may be different, because I
change some parameter to try to fix it, but the problem is not fixed.
I am a Robot 3d Print engineer, normally we will add a compensation for
start end position, if a curve is closed.
…On Tue, 21 May 2024 at 00:59, GregValiant ***@***.***> wrote:
@yhd343762 <https://github.com/yhd343762> please zip and attach the full
gcode file so I can analyze it. What Cura version did you use?
The "G0 F18000 X164.61 Y193.023 Z1.4" line is simply a travel move going
up to the start of the next layer (plus your Z-hop height of 0.40). I'll
need to see what is happening prior to that.
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Thanks for your email：）
…On Tue, 21 May 2024 at 00:59, GregValiant ***@***.***> wrote:
@yhd343762 <https://github.com/yhd343762> please zip and attach the full
gcode file so I can analyze it. What Cura version did you use?
The "G0 F18000 X164.61 Y193.023 Z1.4" line is simply a travel move going
up to the start of the next layer (plus your Z-hop height of 0.40). I'll
need to see what is happening prior to that.
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Excellent model that is easy to analyze. I picked the seam location at gcode Layer 5. The key word here is "Un-Retracted". There should be a solid string between the walls which would form a vertical surface connecting the two walls because there is no retraction, and there should be oozing. We don't see that. This is a zoom shot from your gcode file when viewed in Cura. The 0.10 lines are the wipes and they are in the opposite directions that the associated extrusions were. On every layer, the last extrusion of a wall meets up exactly, to three decimal places, with the first extrusion of the same wall. In the Cura Simulation view you can check that by moving to the area with the horizontal slider, then click on the slider "ball", then use the left and right arrow keys to step through the gcode. Whatever is going on with these "Z-gap" reports I just cannot find anything in the gcode files to account for it. I think there is something going on with either the printers or maybe the filaments being used. It is apparent to me that the Cura generated gcode is correct. I've printed a couple of the gcodes that have been submitted here and I can't duplicate the problem with my older Ender 3 Pro. I'm going to remove the bug label from this as it must be a problem with the printers, or with the material because it isn't the gcode. In addition @yhd343762 is this line: |
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@GregValiant Finally I find the reason.every time at the start position the extruder move on it but didn’t extrude anything. So I find there is a function named „Extra length on restart“, I change it from 0 to 1mm, now the wall are connected, but it extrude too much. I will reduce it later. |
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I have solve this issue, 2 methods: |
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.6 nozzle and Cura 5.6.0 also giving me huge gaps in seams like that. Switching to OrcaSlicer solved the problem. Unfortunately, i like Cura interface better, but for .6 nozzle i simply cannot make it work. |
Application Version
5.3.0
Platform
MacOS
Printer
Sovol SV06 / Kingroon KP3S
Reproduction steps
I've been printing lately cookie and clay cutters and since the moment I updated to 5.3.0 I can't get rid of these annoying gaps in my prints. They only seem to happen in certain orientation of the parts but I've had no luck tweaking settings to completely avoid them.
Actual results
The results are shown in the pictures.
Expected results
I am doing almost exclusively single walls prints so this issue ruins my parts. I've tried using outer wall wipe distance, not using coasting, deactivating linear advance, turning off retraction... nothing worked.
Checklist of files to include
Additional information & file uploads
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