Supports to model interface
I have an issue with the interface between the support structure and model in that I am using the concentric top and bottom infill, but at the interface the infill reverts to monotonic. Slicing without supports also shows that the unsupported area does not have concentric infill either. Is this a "feature" of the slicer or a bug?
The attached file is the .3mf project file used on the latest PrusaSlicer for the MK4.
RE: Supports to model interface
No project attached. You have to zip up (into a ZIP) most things to attach them to the forum. Also check immediately after posting that it attached as the edit window is very short.
RE: Supports to model interface
The project file 'pinion.3mf' is attached here
RE: Supports to model interface
The project file 'pinion.3mf' is attached here
Please zip before uploading.
We will do what we have always done. We will find hope in the impossible.
RE: Supports to model interface
So shared links don't work either! I'll go back to school.😉
RE: Supports to model interface
So shared links don't work either! I'll go back to school.😉
RE: Supports to model interface
Your issue is that its bridged, it isn't bottom fill.
The only way I know of to get slicer to treat layers that are not touching the build plate as bottom layers like you want is to use Contact distance 0 (Soluble Supports). When configured like that then it is printing directly on top of the support and so treats the layer as a 'bottom' layer.
ANY gap between supports and by definition you are printing the infill as bridged and so it cannot be treated as a bottom layer. So slicer doesn't. So you get a normal rectilinear bridged layer above the supports.
Of course if you aren't using soluble supports thats not an option as it will weld them together.
Concentric infill is a poor choice anyway in general. It can get overlaps where it works inwards and outwards when they meet, which your preview on the project shows. That usually leaves a little bump.
Better to increase the perimeter count in that area to fill the space rather than concentric infill. That also nicely gets around the bridging limitation too. Examine the copy of your part and the modifiers applied in the (hopefully attached) file.
RE: Supports to model interface
Thanks for your detailed response. I could have remodelled the prototype to avoid supports, but that created other issues.
Your opinion that concentric infill is not good is a bit strong, as the asthetic appearance is ideal in many applications, and many of the other patterns produce the artifacts you refer to as well. But, the textured plate hides any asthetic looks, anyway! 🙂 All better than blue painters tape I was using 12 years ago.
Thanks again.
Mike