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I am trying to use the boolean modifier to cut holes inside the long object that is displayed in the picture. The holes need to have the shape of the 4 diamond pieces that or also displayed in the picture. When I'm using the boolean modifier with the option difference selected, it only works properly with 2 of the 4 shapes (as seen in the picture). To my knowledge both the parts are healthy. I already recalculated the normals and removed doubles on both the objects. I also tried to triangulate bigger faces and subdivided the mesh of the diamond shapes but both resulted in worse outcomes.

I also included the blend file.

Does anyone have a solution? enter image description here

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The bmesh fails in some cases, try the Carve solver instead.

enter image description here
[Click on the image to enlarge.]

The documentation is very sparse about the inner workings of this option.

Solver
Determines what set of algorithms are used to calculate the boolean operation. Carve uses the external Carve Library while BMesh uses Blender’s built-in library and should give better results.

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    $\begingroup$ In my experience of the Boolean modifier, BMesh does well with strictly manifold meshes and Carve can cut with a non-manifold mesh such as in blender.stackexchange.com/a/106016/29586 . I suspect that the object used in the example is not strictly manifold enough for the BMesh algorithm - since it’s 4 distinct volumes rather than one single volume. $\endgroup$
    – Rich Sedman
    Apr 30, 2018 at 20:09

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