[Solved] PETG has exposed infill.  

RE:

Without your prusa slicer project file its impossible to say.  If you want answers then get your slice to the same point where you are having issues and then please use File>Save Project As in Prusa slicer.  That will save a xxx.3mf file.  The Prusa slicer 3mf file will contain the part(s) but more importantly copies of the 3 profiles you are currently using.  As such its a snapshot.  With it we can examine ALL the settings, any modifiers etc.

Please be aware that to attach the file to a reply on the forum here you must ZIP up the 3mf file.  If you do not the forum will just silently drop it and not attach it.  With the limited edit time it is best to check your post has it after posting to make sure.  That way you still have time to edit if its not there.

RE: PETG has exposed infill.

It would also be useful to attach a photo of the part showing the problem area

RE: PETG has exposed infill.

 

When I print in PETG, the bottom of the print has exposed infill. The infill is also exposed when I pull off the supports. I'm using Creality black PETG. Does anyone know why it's doing this?

 

 

 

 

I don't think it's related, but I had to flip the models upside down in the slicer. If I left them the other way, then the slicer preview showed all the infill at the bottom as if the bottom layer didn't exist at all. I don't know why it did that, but it's annoying.

Seems like a dead giveaway that there's something messed up in your settings. But as Neophyte said, without a 3mf file, who knows.  

RE: PETG has exposed infill.

I'm guessing your part is below the bed in the slicer 

RE: PETG has exposed infill.

A "sinking" part itself doesn't cause this, as the slicer will still put solid layers down on the bed.

RE: PETG has exposed infill.

My bad. Here are the slicer files 

https://drive.google.com/drive/folders/1j1hYVtbl48iWiBc4J9MpWFBWo2KvEfiC

RE: PETG has exposed infill.

https://photos.app.goo.gl/9Y83FQ9aM8mvGmxo9

And here are the photos. Some are from after I've removed supports.

I'm not sure how to get a 3mf file and slice it to the point where I'm having issues. I'm inexperienced with this.

RE: PETG has exposed infill.

Posted by: @foxrun3d

A "sinking" part itself doesn't cause this, as the slicer will still put solid layers down on the bed.

Good point.

RE: PETG has exposed infill.

You've given us the gcode files, we really need to see the 3mf files, see neo's instructions above

RE: PETG has exposed infill.

Posted by: @jp-guitars

You've given us the gcode files, we really need to see the 3mf files, see neo's instructions above

How do I "get my slice to the same point where I am having issues"?

RE: PETG has exposed infill.

Go into the slicer, load the model, make any changes you made previously, then at the point you would normally slice it save it via File>Save Project As

RE: PETG has exposed infill.

Also please don't link files off site.  Many of us will not download them.  Zip them up and attach them here.  For pics use add media to add mulitples.

As for getting to the point of the issue, set up in prusa slicer to slice exactly as you normally do.  Slice it and look at the preview so you can see the missing layers.  At that point use the File>Save Project As and then follow the earlier instructions about zipping it up and attaching it here.  For attaching a single file the Attach file button below the edit window is normally used.

RE: PETG has exposed infill.

Got it. I'm gonna try one more print and save the project file this time. If stuff goes wrong, I can bring it here.

RE: PETG has exposed infill.

You don't actually have to do the print unless you want to. We just need to see the project file ready to slice

RE:

The replacement worked, but I tried to remake the project file the way I remember it, just in case there's something that I could be doing better and keep this from happening again.

RE: PETG has exposed infill.

I can't see any issue with the project and the gcode it generates does not have the same problem that the first lot you uploaded to google had, so it is difficult to say what went wrong previously. But the fact it is producing different output indicates there was some parameter that was causing the issue.

For future reference I would suggest it is always worth saving the project/3mf file at the point you export the gcode. It allows easy reprinting, tweaking or problem solving should that be required. I personally don't bother keeping the stl files any more as you can always get to the models from the 3mf just as easily and given the advantages of 3mf it is a no-brainer, for me, to go down that route

RE: PETG has exposed infill.

I took a look at at the posted bgcode from the google link.  After using Prusa Slicer Viewer to convert it back to plain text and looking at the actual contents the problem is quite simple and obvious.

; bottom_fill_pattern = monotonic
; bottom_solid_layers = 0
; bottom_solid_min_thickness = 0.5

The settings which are saved at the bottom of the gcode show that bottom layers was set to Zero.  The minimum thickness value is only applied if there is at least 1 bottom layer.  As such Prusa Slicer generated gcode exactly as it was supposed to.

Also agree with JPfor all his reasons plus more, I always save the project, even before clicking slice.  That way if there ever is a crash due to some model issue that PS cant cope with I don't have to reset everything up.  And yeah as 3mf is compressed the files often end up smaller than the original stl files.

RE:

; bottom_solid_layers = 0

Yes, that'll do it.

So that means the 3mf file you posted is not quite what you used to print it in the first place. 

I would also note that the orientation of the parts in the 3mf file is not great. I would flip all parts by 180 (top to bottom) and everything should print fine without supports. Some minor bridging which the printer can handle easily. 

RE: PETG has exposed infill.

Posted by: @foxrun3d

 

; bottom_solid_layers = 0

Yes, that'll do it.

So that means the 3mf file you posted is not quite what you used to print it in the first place. 

I would also note that the orientation of the parts in the 3mf file is not great. I would flip all parts by 180 (top to bottom) and everything should print fine without supports. Some minor bridging which the printer can handle easily. 

Huh. Mystery solved! I wonder how I set that to zero.