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I'm practising with a mesh object typical cube. Added a whole bunch of cuts in the mesh. I believed the mesh is clean with no problems, until I added the subdivision surface, and down the corner of IMG 03, suddenly it's creating a triangle and also some weird unclean artefact on the surface. That I sort of cleaned adding more loop cuts, but it didnt clean 100%. But that corner triangle I cant figure out what it can cause it.

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Your mesh has some n-gons and the Subdivision Modifier doesn't like it. :)
Make your mesh only from quads and it will subdivide properly.

Other little issues:

  • Messed up scale - Solve through Object > Apply > Scale (and check normals afterwards)
  • Non-manifold faces - some faces are going through another. This has to be repaired manually. Either merge the vertices, or move the faces farther away.

Quads vs. N-gons with Subdivision Modifier

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Apply your object's scale to avoid problems in the future.

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Here is your .blend back, repaired so you can compare :).

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  • $\begingroup$ I cant believe that I didnt noticed the n-gons right in front of my mesh. Thanks for your help Jacym! ibb.co/g6gbSrW $\endgroup$
    – blender breath
    Commented Feb 9, 2020 at 2:10

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