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I am just doing a basic boolean cut of small cube mirrored across x,y axis (4 cuts) in a larger cube. I can't bevel it afterwards. Why am I getting these additional lines there?

enter image description here Ultimately I would want to get 3d box insert that looks like this (but beveled a little, no sharp edges): enter image description here

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  • $\begingroup$ Blender faces don't support un-connected holes, and the automated Boolean fix for that doesn't know how to find the most 'desirable' connection, which will vary from case to case. If the cavities here don't need to be procedural (to be animated, for example), there's no need for a Boolean. $\endgroup$
    – Robin Betts ♦
    Commented Mar 19, 2023 at 19:07
  • $\begingroup$ boolean ops are never basic, but just unpredictable depending on what you want to do after that. $\endgroup$
    – lemon
    Commented Mar 19, 2023 at 19:14
  • $\begingroup$ hmm, so what would be a better way to cut these holes so I can bevel them on all sharp edges of the entire cube with holes? $\endgroup$
    – mrblender007
    Commented Mar 19, 2023 at 19:19
  • $\begingroup$ I think you already have an answer for that. If it's not enough described for your needs, ask in comments. $\endgroup$
    – lemon
    Commented Mar 19, 2023 at 19:24
  • $\begingroup$ For your second question, the boolean is a good solution in that case, maybe use a sphere with less vertices to make the corrections easier $\endgroup$
    – moonboots
    Commented Mar 20, 2023 at 8:32

2 Answers 2

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Something along these lines?

  • Subdivide
  • I Inset all
  • CtrlB Bevel cross-bars
  • E extrude panes

enter image description here

.. followed by an EZ extrusion downward of the perimeter, F to fill, and maybe another inset of the bottom.

enter image description here

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    $\begingroup$ difference between explained and unexplained answer... +1 $\endgroup$
    – lemon
    Commented Mar 19, 2023 at 19:31
  • $\begingroup$ will that method allow me to also cut half of a sphere in the middle of the cross and bevel all sharp edges in the model? $\endgroup$
    – mrblender007
    Commented Mar 19, 2023 at 19:36
  • $\begingroup$ Hi, @mrblender007.. please illustrate in your original question where you would like this half-sphere cavity to be .. :) $\endgroup$
    – Robin Betts ♦
    Commented Mar 19, 2023 at 19:54
  • $\begingroup$ @RobinBetts added to original question $\endgroup$
    – mrblender007
    Commented Mar 20, 2023 at 0:26
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    $\begingroup$ @Robin Betts I agree that my answer was lazy but the initial question was a bit vague so you never know how accurate you need to be ;) $\endgroup$
    – moonboots
    Commented Mar 20, 2023 at 8:51
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Booleans often give bad topology, therefore the difficulty to bevel. You need to correct the topology or start your shape from scratch with another method (your shape is rather easy and doesn't need any boolean actually). As for the edges that you are showing, you can't cut a hole without connecting the inner edge loop to the outer edge loop.

For the shape, create these edge loops with some CtrlR:

enter image description here

Then extrude down:

enter image description here

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  • $\begingroup$ ctrl+r doesn't do anything, and btw would that method also work for cutting out half of a sphere in that box? $\endgroup$
    – mrblender007
    Commented Mar 19, 2023 at 19:23
  • $\begingroup$ @mrblender007: I am sorry to say but asking for "additional" things you didn't ask in your question isn't fair and shouldn't be done. Concentrate only on your question asked. If you have additional question, please open a new post. thx. $\endgroup$
    – Chris
    Commented Mar 20, 2023 at 6:29
  • $\begingroup$ @mrblender007 Ctrl+R might not do anything on your object since it can only work with quads, but here it is shown how you should build the object new from scratch. And why your object is problemstic for beveling I explained in my answer to your first question which you seem to ignore. $\endgroup$
    – Gordon Brinkmann
    Commented Mar 21, 2023 at 18:29

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