I don’t know if this is a Luban issue or a FreeCad one, so I’m posting in both forums…
I have a manifold designed in FreeCad that has (or should have) a hollow tube running from 1 ‘leg’ to the other. When I look at the model in FreeCad, it sure looks like it’s hollow, but when I slice it (using either Luban or CURA), the cross pipe becomes solid (this view is from CURA, but Luban slicer shows the fill too)! Any guesses what the issue could be?
Quite simply, you must set the support structure in Cura to 0%, as in Luban, but then you must work with a layer height of 0.1mm, otherwise the tube will collapse at the top, that is why the support structure inside the tube!
You can still try it with Stützstrucktur tree, but be prepared for the structure can be difficult to remove later, since one comes as good as from any side not to the interior of the upper straight stretch of the tube!
By default, Cura shows support in blue. infill in orange. So it’s not support. which should also be visible underneath the long overhang if it was enabled. (good luck printing that kind of overhang without support btw.)
If you don’t share any files, we can only guess.
My guess is there is something wrong with your file.
@brvdboss ,
you’re right, just looked again, Stützstrucktur is blue.
Then we need to have the file to see more, or you open them times in 3D Builder, I had someone here before, the 3D Builder then showed nen error that you can let correct from the program and then everything was OK.
Usually that means there’s something wrong with the model file, and it’s not detecting/attaching the inner walls to the model somehow. It could be a mesh problem (missing faces/vertices), it could be a wall thickness problem (inner wall of the pipe is 0.0mm thick), etc. There are many posts on the forum about tools that find model errors. I’ve heard Mesh Mixer mentioned before, but I haven’t used it.
Can you link to the model?
I tried to add the model to my original post, but I guess it didn’t take???
Based on the suggestions in this post, I increased the radius of the bends so the different sections didn’t intersect, and everything sliced just fine…
Based on that, my guess is the inner walls were too thin, causing the slicer to ignore them.
Are the feet hollow, then the infill starts where the bend starts? Or is the piece solid from top to bottom?
The ‘feet’, cross piece and tube out the top should all be hollow and interconnected. After fixing the radius of the path from foot to foot across the cross piece everything slices correctly.