This topic contains 10 replies, has 3 voices, and was last updated by 
Simon 1 hour, 50 minutes ago.
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Any ideas what causes the attached lines on the left print?
They were printed individually but on the same printer, with the same material and are the same model.
I’ve started noticing this one some prints but not others. Any ideas? If its pogo pins I’ll scream!
STEELMANS 3D PRINT.
3D Hub: www.3dhubs.com/service/steelmans
Website: www.steelmans3d.comUsing my telepathic abilities I will presume that you have a line which appears at the same layer as another feature of the model.
@simonhoult You can confirm this using an image attachment 🙂
@pete Tee hee, I’m just testing your abilities, sorry.
Not this time! It is quite uniform this one. No feature changes all round the part.
BTW does your comment mean that it is now accepted that strange lines do appear at the same layer as other feature of the model? Not expecting a solution to that one, just good to know I am getting the same as everyone else.
STEELMANS 3D PRINT.
3D Hub: www.3dhubs.com/service/steelmans
Website: www.steelmans3d.comThe ghosting line I described still hasn’t been explained in a way I know how to fix. When you have a line which appears at the same layer as a feature change in the model. It isn’t appearing everytime which makes it both tricky to diagnose and less disruptive to regular printing.
Those lines you are seeing we were talking about today. The suggestion is a variation in pressure caused by the bowden tube movement as it constricts around the filament and perhaps stretches slightly. Perhaps if you are doing it again you can place it further to the right or left of the build plate and see if there is a difference.
@pete Regarding the ghosting line, I keep using the words “significant change” as I don’t know how else to describe it. The “line” rings the whole part when a significant change occurs on that layer. For me I notice it on a regular basis. I did initially think it might be something to do with Cura but I wasn’t getting it on my Cubicon using their slicer which is also based on Cura (not sure which version). Anyway like most issues, it is good that they are recognised, at least then I’m not on my own with it.
Again I’m pleased you too have seen these uniform lines (obviously not pleased we are getting them). I will post more photos as I print that might help. Note that both the prints in the original photo were in the exact same location, nothing changed. I also noticed that the prints look a different colour in the photo, they aren’t, they are exactly the same.
Here is another attached. This print didn’t fail, I just had a power cut. I think it must be the high winds we are getting today. If you look at the close up it appears that the layers are staggered. Maybe that helps?
STEELMANS 3D PRINT.
3D Hub: www.3dhubs.com/service/steelmans
Website: www.steelmans3d.com@simonhoult This is apparently common throughout 3D printing. There are several explanations I have found.
For the Robox specifically, some models will have a rounding error. This is especially true with SolidWorks models. This can lead to periodic features like you are pointing out.
The general cause of this type of banding is the Z screw isn’t perfectly straight and is pulling the head around just enough that you can see it. This is very common in Beta units because the screws aren’t as straight as the new units, but I haven’t seen it in a newer unit.
I operate two Betas and one Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/benThanks @bhudson If the Z screw isn’t straight enough, could it lead to the Z screws jamming? The reason I ask is that I have had new Z motors on both my printers (when both had less than 100 hours on them). I now have lead nuts on the way as the problem is back on one of the printers.
STEELMANS 3D PRINT.
3D Hub: www.3dhubs.com/service/steelmans
Website: www.steelmans3d.com@simonhoult I have been running Beta units with bent screws for 2.5 years and have never had a problem with the Z drive jamming. I find that Z motion issues are debris and failure to clean and lubricate properly.
I operate two Betas and one Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben@bhudson I thought it sounded odd but thought I’d check as you mentioned it. I’m dealing with the Z screw jams with support. Couldn’t find any debris of faults with the screw but changed both motors to solve. One is running well be the other machine has it back again. Anyway good to know it isn’t related to this anyway.
STEELMANS 3D PRINT.
3D Hub: www.3dhubs.com/service/steelmans
Website: www.steelmans3d.com@bhudson I just asked the customer and he didn’t use SolidWorks. Also I started printing some from the same batch on the Up Box and it isn’t repeating there, see attached.
STEELMANS 3D PRINT.
3D Hub: www.3dhubs.com/service/steelmans
Website: www.steelmans3d.com@pete As suggested I did a few test prints to see if bed location had any effect on banding. They were all printed separately but attached is an image showing the rough location they were on the bed.
The only real “banding” was in position 5 but then as you can see on photo 5_rotated.jpg it was only on the front face so not really banding all the way round. On other prints banding has been on centrally located prints (pos.3) but I guess this depends on the model.
By the way I check the gcode preview in Simplify3D and everything looked in line and ok.
Please excuse the warping. As it was a test print I just grabbed an old bed that hasn’t been cleaned.
I doubt this helps at all but you never know. I will start to take and post more photos of models that show banding or ghosting. I know these two issues aren’t connected but I experience them a lot.
STEELMANS 3D PRINT.
3D Hub: www.3dhubs.com/service/steelmans
Website: www.steelmans3d.com
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