Crazy issue, trying to rule out printer.
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I see what you're talking about. It's because the printer is not doing a retraction for that move, and a huge line is going where the travel move is. Fix your retraction settings in S3D.
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@bot:
I see what you're talking about. It's because the printer is not doing a retraction for that move, and a huge line is going where the travel move is. Fix your retraction settings in S3D.
That's what I first thought as well, however I witnessed the printer move diagonally while lying down the plastic. If you look at the rest of the print you'll not see any signs of retraction issues. I'm going to try and reproduce the g-code and problem and view it in another g-code previewer instead of S3D. I doubt the issue is the printer however I witnessed the wrong move (multiple times). It's as if it skipped one move and jumped to the next which resulted in a diagonal move instead of an L (flipped).
I'm still assuming the printer would be incapable of making such a mistake so I need to get the g-code produced again so I can confirm it's the slicer.
Thanks,
Jeff
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Ok, I managed to get this to happen again. Virtually identical results.
If you open this image in a new tab you'll get full rez.G-code used to create this mess: dual_fan_duct.gcode
and a couple of S3D shots to show what should have happen.
Notice nothing has diagonal lines on the inside perimeter.
Feedback welcome, just trying to get to the bottom of this problem. It's too repeatable to be a detach issue, if it is I'll be really surprised.
Thanks,
Jeff
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Ok, testing something. I suspect it's air printing that line. I just set S3D to do Outside-In for outline direction instead of Inside Out. If my suspicious is correct that should solve this issue…maybe. Printing 2 Outline/Perimeter shells does solve it which would also make sense. My apologies if it turns out to be an air print, hopefully it can save someone else some headaches.
Edit: Changing to outside in didn't change the behavior at all surprisingly.
Jeff
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I still don't know where the diagonal extrusions are that you are talking about.
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I still don't know where the diagonal extrusions are that you are talking about.
I think we are supposed to be looking at the pale blue blue lines in the S3D pics which show an unsupported inner perimeter - hence the problem getting it to print IMO.
Edit. I can't see a diagonal extrusion in the first print picture but I can in the second. Difficult to spot with everything that is going wrong. -
The diagonal extrusion is sitting under the pile of what should have been bridges. I think the bottom inner extrusion is unsupported and of course not bonding to the side, I'm printing at 80mm/s with 3000 acl and 150mm/s travel moves. So watching it the bottom inner extrusion gets pulled away by a fast travel move which gives the illusion of the printer moving diagonal. Just a case of the mind playing tricks on me seeing something move but not seeing the true source.
If I print with 2 inner perimeters instead of 3 then I don't get the hanging perimeter and all is well.
I appreciate everyone looking at this mess, I'll resort to highlights and arrow for future posts of this nature, which I hope I never have.
Thanks,
Jeff
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Sorry I wasn't more clear before. I know exactly what you're talking about, and it IS a retraction issue.
Under the "Advanced" tab of S3D slicing parameters, you'll find "ooze control" and an option "only retract when crossing open spaces." Make sure that option is not checked.
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@bot:
Sorry I wasn't more clear before. I know exactly what you're talking about, and it IS a retraction issue.
Under the "Advanced" tab of S3D slicing parameters, you'll find "ooze control" and an option "only retract when crossing open spaces." Make sure that option is not checked.
If you look at the second print, open the image in a new tab and zoom in you'll notice if it's an Ooze it's the largest in recorded history
I also tried a print with and without that setting as I to was thinking the same thing. Closer inspection reveals it's a normal extrusion that just didn't stay glued. I could probably get it to hold against the side while floating in air as it is by playing with the temperature and cooling a bit more. The crazy part is I can print this part over and over with the same g-code and get the same results each time.
Thanks,
Jeff
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Do you have the option enabled or disabled? It should be disabled, if my hunch is correct. Did you try printing the object with that disabled?
Also, do you have a bowden tube? It is not abnormal, at all, for enough pressure to build up to expel that much filament during a move, especially considering you say your print feedrate is so high.
Edit: Oh I just saw your last explanation. That seems to be it.
