I am experience a smooth vertical crease on models i print on the left, right, and front side. The back side has the seam so I know its not the seam. In the image I am sharing the red outline is showing you the seam while on the other side the blue outline is showing you a smooth bumped out crease that is not in the models. The smooth crease is also on the left and right side of the model but more faint. What causes this and how do I fix it.
ânot in the modelâ can mean several different things (there could e.g. be inverted faces that look fine in a software 3d viewer but confuse the slicer when it runs making it add weird cuts or creases).
First, run the .STL through Free online stl repair tool and post the hole log in this thread (i.e. the text that appears with black background). Usually downloading the resulting file (XYZ_fixed.stl) and running it through Luban should solve the issue.
If this does not help, recalibrate the extruder and print with a lower speed.
The STL repair tool requires 50mb or less. So doesnât wonât work however, when I mean not in the modelâŠ
âą Shark was a download - So its possible this one will have that issue
âą Ghost I created in blender - Not possible to have this issue
âą This is also happening to everything I print so the chances that every 90Âș is a bump out from the seam and 180Âș perfectly from the seam is worse makes me also think this is not a faces inverted issue but a snapmaker issue.
I will keep trying to print the ghost to keep this as the constant variable for testing as I know this model doesnât have any issues.
I have already calibrated my extruder but will try this again and report back afterwards.
Here is another example of another print I did over night same issue but I labeled things:
The STL repair tool requires 50mb or less. So doesnât wonât work however, when I mean not in the modelâŠ
Try to reduce the number of faces to get filezise down, for example using MeshLab
Wouldnât be too sure of this, seen a fair share of things made from scratch in blender with watertightness issues or other anomalies
This looks like you are slicing with Cura - did you try using Luban - did the results differ? Luban does use a modified version of Cura, but has a few optiomizations for Snapmaker hardware.
If you need to use Cura, did you try the Randomize Z Seam setting?
âą Extruder Re-Calibrated
âą i donât think the z-seam is the issue as i have placed it on the back of the model in cura and as you can see in my cura screenshot the nozzle starts and finishes in the same spot so its not a pause and move every 90Âș issue.
Tried in Luban and results are the same with the outward bump creases and model printed worse at the base of the ghost and ruined it so I think I will stick with Cura.
I will play around with STL Repair and Mesh Lab next to see if that fixes something and report back
PS thank you for helping me problem solve by the way.
How does your module feel on the linear rail, does it wobble?
Hey Kwi I used the STL Repair and tried reprinting and got the following:
I tried printing this version but still got the same result with the 3 smooth bumped out vertical lines. When looking at the model i canât see these bumps at all on the computer either.
@MooseJuice
here is a video of it printing and it looks smooth. Right side is where the seam is. Back and front are the faint seams and left is the large seam. WeTransfer - Send Large Files & Share Photos Online - Up to 2GB Free
it doesnt look very wobbly but i would try to take your hand to see if it pivots - some of my super early posts is battling parts out of round and theres a lot of footage of me discovering the issue and showing it to snapmaker to get some replacement part etc.
actually looking at the video, the bed is rocking. maybe your over extruding and its pushing the table down a bit, or maybe your offset is too close, but you can see it pretty good if u watch the horizontal plane of the print sheet on the edge.
watch this spot on your video
if its not relating to the nozzle pushing the part down as it travels⊠im not really sure how to combat that, but maybe the build surface is a bit loose on the plate or the linear modules have alot of slop, but it may be just unfixable without some extra supports or something. maybe somoene else has an idea here.
If I understand correctly it is always on the front, back left and right? No matter how the model is orientated? (if you rotate the ghost 45 degrees, the lines are still in the front, back and left?)
Then I would check the backlash of the linear modules. Have you modified the backlash compensation value?
I would expect these kind of things too show up if there is too much play on the axis.
To test wobblyness of the buildplate, I would suggest placing the model somewhere totally different on the buildplate in Cura/Luban (e.g. front left corner) and see if it becomes worse/better or at least the location/orientation of the seams change.
Does the seam also appear on totally unrelated models (e.g. calibration cubes or benchies)?
Updates and what I have tried so farâŠ
âą Now using this model to switch from 4-5hr prints to 25m print tests: Custom Prime Tower by ketterrm - Thingiverse
âą Did linear advance - No Change still having same issue
âą Rotated seam to be 45Âș angle and noticed that the smooth bumps did not move they stayed in place at front, back, left, and right orientation.
âą Printed Center and each corner. they all seem to have the bumps but the quality also gets worse on the corners.
To me that indicates that there is too much play/backlash on your linear modules.
Also, I think you have the bed mounted upside down. The nuts should be at the bottom, looking at the pic from @MooseJuice to indicate the bed rocking and looking at the video, I think itâs mounted wrong.
Although I think thatâs another issue, not necessarily linked to the problem youâre having now.
But it will have a bad impact on the bed leveling.
Please post some pictures of your machine (from the front and side and the bottom of the bed visible) to confirm your machine is assembled correctly.
@brvdboss Is there a specific linear module I should adjust and how do I do that?
The only thing that feels like it might be kinda loose is the bed frame but that also feels solid I think its more about its size. The 3d print head feels good / solid and not wobbly.
Here is pictures of the bed. I think its done right. Canât really show the front very easily as thatâs up against a wall. Let me know if you need more pictures or this will do:
Thatâs upside down. Nuts should be facing downwards.
-S
1 Like
I donât recommend doing this, it will screw up the model almost every single time. Itâs better just to take the time and learn how to use something like Blender to check it for yourself, itâs not that difficult to fix a messed up model, but if itâs severely messed up I advise you skip that model and find a different one, unless itâs one you created then you have no choice. If you need help using Blender to repair files you can send me a DM, I have a process of my own that churns out flawless models from scratch with no errors, as well as fixing downloaded ones, Iâm perfectly fine with checking a model and fixing it for you if need be (this goes for anyone who needs help).
As @sdj544 already mentioned, the bed is upside down. Check second 38 in the assembly video:
They state to make sure the nuts are facing up for installation, but you put the base on top of it and attach it. If you then position it correctly, the nuts are facing down.
This might not solve this particular problem, but I suggest you start with fixing this first before trying to debug further.
You can also check it in the assembly manual (which has been updated since initial release)
Fixed the bed frame orientation, calibrated bed level, and printed a new piece in A and D spot in my diagram and they printed the same way. I still also have the smooth bumped out creases.
Ok, at least we already got the assembly of the bed ruled out for now.
Issues that remain then is the wobble in your bed. Not exactly sure how to tackle that (except adding extra linear rails etc, but that should not be needed for 3d printing anything)
I looked at your video again (from the wetransfer link) and between second 6-7 there is a really short very quick movement/shudder that seems strange. It might be a small travel move or something, but it seems a bit awkward to me.
Did you ever share the generated gcode? I canât seem to find it.
My bet would still be on something backlash related. It reminds me off this thread: A350 - Not printing perfect circles
You could try to fix it yourself, thereâs a guide by @sdj544 here: Excessive play in x-axis linear module bracket - #9 by sdj544
This probably will void your warranty, so you might want to check with snapmaker support first if they can maybe identify the issue better.
1 Like
Heres the the g-code:
test-3.gcode (982.3 KB)
That quick movement / shudder is where the seam is and I think it makes that movement to change to the next wall line.
Ill send a email to support to see if they have any input too.
Update: Heard back from Snapmaker team and the following was suggested: retraction distance 1.5mm and retraction speed 25mm/s. I tried this and still no luck. Waiting to hear back still for another suggestion.