I generated a bunch of random cubes from MATLAB as .STL and imported into Blender. All cubes intersect so there's a bunch of internal geometry. I did ctrl-F -> intersect to create edges between cubes, but now how do I remove all the vertices/edges/faces inside the cubes?

I checked out Simplify mesh by cutting out inside parts and tried to remeshing modifier, which did absolutely nothing possibly b/c I'm noob with this software, and tried the code which failed on line 4.

I'm used to using CAD, so could I possibly make an enclosure, boolean subtract from said enclosure, then fill the enclosure up with a second solid that doesn't have internals? Can Blender do that? Help!

enter image description here

Edit: Figured it out. Bool tool solved all my problems. Regular boolean would take forever to implement for something like this I think.

  • $\begingroup$ Check this out blender.stackexchange.com/q/71687/2517 $\endgroup$
    – Tak
    Feb 1, 2017 at 21:22
  • $\begingroup$ Works, though it only cuts the edges for one cube b/w that and another. Also, how would you do this for all cubes? I tried selecting all edges and it says no intersections found. $\endgroup$
    – yoshi
    Feb 1, 2017 at 22:21
  • $\begingroup$ have you tried selecting all visible faces, then invert selection and delete? $\endgroup$
    – m.ardito
    Feb 1, 2017 at 22:39
  • $\begingroup$ Thanks for the advice. How do I select all external faces since there are many cubes inside that I can't see? box select + select>more? Would take a while. $\endgroup$
    – yoshi
    Feb 1, 2017 at 22:51
  • 1
    $\begingroup$ Possible duplicate of Removing internal geometry $\endgroup$ Feb 1, 2017 at 23:43

1 Answer 1


Bool Tool Addon (fast enabled)
⎈ Ctrl⇧ Shift+ after separating cubes using P> by loose parts in edit mode.

  • $\begingroup$ This is the easiest method I have found in my brief search and testing to date. If you continue to struggle with internal faces showing up, there is a more robust method that I have found in this answer here that uses the Booltron add-on "Slice" feature with a cube object as a container: blender.stackexchange.com/questions/5752/… $\endgroup$ Apr 15, 2020 at 4:44

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