The below settings can be used to fix errors in models that are not correctly designed for 3D printing. These models will usually look good in the solid view, but if there are faults these are often shown as red areas in the X-ray view.
Union overlapping volumes
If a model contains two volumes that interfere (as if they were placed through each other), you can use this setting to fix that. Union overlapping volumes will recognize these interferences and will try to slice it as one volume.
Remove all holes
Solid models that contain unnecessary holes on the inside can be repaired by enabling the remove all holes setting. Cura then closes the holes for slicing and makes sure the inside is printed correctly.
When polygons are missing in the shell of the model Cura won’t be able to slice the model correctly. In this case you will usually see faults in the shell and/or infill in the layers view. By enabling extensive stitching holes in the shell will be closed so that it can be sliced as expected.
Keep disconnected faces
Models that contain holes on corners are ignored by Cura. It’s simply impossible to know how the missing geometry should look. With this option enabled, Cura connects all neighbouring geometry to close the model.
Merged meshes overlap
This setting creates a overlap where merged models meet. The result is a slight over-extrusion on the joining areas, which can improve adhesion between the two parts.
Note: Keep this setting low, between 0.0 - 0.2mm, to prevent too much over-extrusion
Remove mesh intersection
Cura detects if meshes loaded on the build plate overlap. If they do, Cura removes one of the meshes partly to prevent extruding double on those parts.
Alternate mesh removal
When Cura detects overlapping meshes, it normally removes one of the meshes completely. With this option, the meshes are printed alternating per layer, creating a mix of the two.