Hello! I’ve had this problem with my printer for a little while now, and it’s my big blocker for printing at decent speeds. I don’t recall the printer doing this new, but I couldn’t point at what firmware it popped up at because I was printing round things for a while and this doesn’t show up on those, only angle corners.
On the corners of almost all of my prints I get these underextrusions where there is a slight gap where it appears as though the hotend did not extrude enough through the corner. This gets worse the tighter the corner is. At high enough speeds this problem leads to actual gapping.
I’ve tuned the extrusion amount using the method on the forums, and while turning up the multiplier in software does help, it has the downside of clear overextrusion in other places, as well as ruining the dimensional accuracy of the prints.
It seems to be slicer-agnostic as Simplify3D as well as Cura sliced models (I prefer Simplify and tried Cura just to make sure it wasn’t the slicer). I’m not sure if this is a slicer-solvable problem. Let me know if you’ve seen similar with your printer.
@xchrisd, @Atom - That sounds exactly like the problem, having read up on it. I wonder if that value was changed during a firmware update, because I’m very certain this wasn’t an issue I was facing when I first started printing.
Either way, many many many thanks for your suggestions!
I managed to get a passable print at 60mm/s only by going to K0 and then up to 120% extrusion and overheating the hot end to 215 (so it would be kind of goopy and not yank the corners of the print up from underextruding).
Obviously these settings aren’t really tenable and I’m not sure what’s wrong. Moreover, it seems to be getting worse over time. I used to be able to hit 110mm/s with this and have less underextrusion than I’m getting now.
honestly, i have never seen a print look quite like that. the fact that its at the corners makes me think its still a linear advance issue, but i’m not sure.
I’m beginning to think it might be a warranty issue. On the following print, the hot end jammed. Opening the side door I was able to very easily push filament through the nozzle myself, so I don’t know why it would have jammed. I’ve also gotten weird “stuttering” on linear extrusions.
I took a better picture of that part from the other post so you can see what I mean in the triangular infill on the upper left side:
To give you an idea of how bad the problem is, I am at M92 E250 and turned it up to 120% (so effectively E300) after the first layer just to not completely tear out the corners… at 60mm/sec. I’ll let you know what I find out.
You may have mentioned this before, but what temp are you printing at? What is your retraction set to? And have you removed the hot end and checked it for obstructions and to make sure the thermister is seated properly?
Before this mess, my typical settings were to do the first layer at 210, then back off to 205 for second before settling at 200C for third and beyond. It worked very well for bed adhesion.
This is actually the second hot end. I replaced the first in case it was causing the issue somehow. This is also a new e3d V6 nozzle just in case that was the issue as well. I did check carefully on reinstallation to make sure that all the pieces were properly seated and connected. Retraction is as follows - with extra restart distance being an experiment to try to help this issue:
Did you calibrate your extruder (e-steps) and your Linear advance (0.1)?
Is it saved properly, with M500 command?
Do you see your values with M503?
If so, what are your printing speeds?
Infill, 100%, right?
This look like a speed issue.
I would suggest you to calibrate your extruder to the right e-steps and then check again.
I have not such big holes at 60mm/s…
I am having a very similar issue. Mine is not nearly as serious as yours is though. If you found a solution id really like to hear it as I cant find this issue anywhere else on the internet
What is the nozzle’s diameter? The line width seems like you are not using the 0.4mm one that comes with the machine.
Also, you can try to reset the controller as the default value has been changed.
1, Connect the machine with a computer via the provided USB cable and then open the console in Snapmaker Luban.
2, Enter command “M502”&“Enter” and then “M500”&“Enter”.
Hello Zero00. That wasn’t the stock one but I’ve had the same problem all the way down to .25mm nozzles as well.
I did set linear advance as suggested but switching to Prusa Slicer seemed to help more than any machine setting. You can still visually see it thin out on corners but at least it’s not as noticeable.
These prints look … horrible! Even if you had said that you are using a 1.0 mm nozzle.
Can you make a short video of the printhead doing the corners? I think it could be possible that you’ve played with the max. acceleration. The extruder stopps too quick (k-vlaue not high enough) and it looks like the nozzle is moving so slow that the corners are melting.
Very interesting and I’m sure the community will solve this.
Can you share your current machine settings (M503)?
Mine are:
(E-step 246.55, K-value 0.18, material = PETG)
PS: The infill can be better connected by increasing the overlap (I’m using 50% but also 75% works pretty good):
