Damaged top layer
Hi everyone,
I seem to be getting an issue when I print this particular part. On the top left hand side of the print it appears that the nozzle is rubbing against the print or something. It only appears to happen to the part in the last 3 layers of the print. I'm unsure as to what is causing this. Any help would be appreciated. I have attached some pictures and other details to maybe help? 🙂
Many thanks,
MrSns
Printer: MK3S
OctoPrint: Yes
Slicer: PrusaSlicer
Slicer Settings: Default 0.15 Quality @MK3
Material: ABS
Print time: 4h 27m
Print attempts: 6
Trouble shooting:
- Performed Wizard again
- Recalibrated Z
- Re-calibrated XYZ
- Recalibrated first layer
- Adjusted P.I.N.D.A.
- Ensured nozzle is clear
Pictures:
Best Answer by Neophyl:
Looking at it infill has nothing to do with the issue. Basically the entire outer section is a 90 degree overhang. The supports are being placed for the perimeters but slicer is treating the areas between as bridging. If you look at the slice preview the bridging is at a certain angle, on the right hand side its short lengths as it goes between the perimeter and the centre section so its mostly working in that area but on the left where you have an issue the bridging is basically really long and has nothing to support it. This leads to the same issue as having insufficient infill for top surfaces as its the same problem.
You need to go into Print Settings>Supports and untick 'Dont support Bridges'. That will force it to place more support under that area. It still wont guarantee it will print but its the best chance if you have to print it in that orientation. The bottoms of those will still not look great though no matter what you do.
As for the over extrusion you have to calibrate your filament settings. A quick google search will bring up lots of hits but have a look at Bobs site, specifically here http://projects.ttlexceeded.com/3dprinting_techniques_calibrating_filament.html#filament-calibration
RE: Damaged top layer
Please post your saved project file (save project as and then zip the resulting .3mf file up for the forum to be able to accept it).
I’m concerned about the internal structure and what those supports are doing so the project is needed to allow easy diagnosis of the slice.
From initial look at the pictures, to me it seems like all your top surfaces are slightly ever extruded. That sort of top pilling is often produced when there’s insufficient infill to support the top layers. That combined with some over extrusion could be causing your issue but a couple of pictures limits what can be gleaned. With the project that’s another thing that can easily be checked.
RE: Damaged top layer
Hey @neophyl,
I decided to print it this way and use the support structures because printing it face down gives the ST a very lined appearance. See below picture. The internal fill is at 15%. If it is over extruding is there something i can do to fix this? Should i try a higher infill? I have attached the requested file.
Requested ZIP file:
RE: Damaged top layer
Looking at it infill has nothing to do with the issue. Basically the entire outer section is a 90 degree overhang. The supports are being placed for the perimeters but slicer is treating the areas between as bridging. If you look at the slice preview the bridging is at a certain angle, on the right hand side its short lengths as it goes between the perimeter and the centre section so its mostly working in that area but on the left where you have an issue the bridging is basically really long and has nothing to support it. This leads to the same issue as having insufficient infill for top surfaces as its the same problem.
You need to go into Print Settings>Supports and untick 'Dont support Bridges'. That will force it to place more support under that area. It still wont guarantee it will print but its the best chance if you have to print it in that orientation. The bottoms of those will still not look great though no matter what you do.
As for the over extrusion you have to calibrate your filament settings. A quick google search will bring up lots of hits but have a look at Bobs site, specifically here http://projects.ttlexceeded.com/3dprinting_techniques_calibrating_filament.html#filament-calibration
RE: Damaged top layer
Thank you @neophyl, I have resolved the issue by following the suggestion you said and also by fine tuning my printer with "life adjust Z - My Way" method which i found here
Many thanks for your help. 😀
Regards,
MrSns