I am trying to subtract a shallow bowl-like shape from this basic trough. The subtraction should only serve to round out the top. Trough to be edited

When I enable the modifier it deletes the internal geometry of the trough even though none of it is intersecting with the cutter.

enter image description here

Trough with boolean enabled and backface culling enabled to show the absence of internal geometry

I have enabled backface culling to show the removal of the internal geometry.

I have checked normals, manifoldness, and made sure that I don't have any colinear plains. any help would be appreciated.

Edit: added picture of the cutter.

  • 1
    $\begingroup$ Boolean modifiers tend to be very finicky. It looks like you can avoid using a boolean operator by deleting the top face of the trough and adding a solidify modifier instead. $\endgroup$
    – stphnl329
    May 26, 2020 at 23:36
  • $\begingroup$ The geometry is already made via solidify modifier. Also the boolean is to make it fit snugly against another modeled part. This is meant to be 3d printed $\endgroup$
    – Michael
    May 26, 2020 at 23:38
  • $\begingroup$ Oh wait a moment, can you clarify what "rounding the top" refers to? Can you add a screenshot of the cutting object? $\endgroup$
    – stphnl329
    May 26, 2020 at 23:39

1 Answer 1


I ended up finding that changing the offset on my solidify modifier fixed the problem. I am still not sure why this happened but that is my fix.


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