Okay, I'll keep this question plain and simple. Whenever I have cube use a subdivision surface and attempt to extrude vertices with that cube I get really awkward results because whenever it adds a vertex the model gets an awkward dent in it as seen below.

Before extrude:

After extrude:

As I once heard from a ten-year-old "Pls Help" And thanks in advance. Here is the file:

  • 2
    $\begingroup$ you probably have a face inside your object, along the mirror axis, you must delete it $\endgroup$
    – moonboots
    Commented Jul 3, 2018 at 20:10
  • $\begingroup$ Nothing appears to be in the object. $\endgroup$
    – Ggdev
    Commented Jul 3, 2018 at 20:11
  • $\begingroup$ Please edit your question and add your .blend using blend-exchange.giantcowfilms.com $\endgroup$
    – Dontwalk
    Commented Jul 3, 2018 at 20:16
  • $\begingroup$ are you sure? because if you put a face along the mirror axis it gives exactly this result: zupimages.net/up/18/27/3dgj.jpg $\endgroup$
    – moonboots
    Commented Jul 3, 2018 at 20:17
  • $\begingroup$ Okay how could one remove this face. $\endgroup$
    – Ggdev
    Commented Jul 3, 2018 at 20:19

1 Answer 1


When you extruded, as you didn't activate the Clipping option of the Mirror modifier, you created a inner face on the mirror axis.

So you can either:

  • Cancel your extrusion and redo it with the Clipping option enabled

  • Or delete the inner face: On the bottom of your 3D view, click Face Select button, disable the Limit Selection to Visible button, you'll see the inside face, then select it and X > Delete Faces.

Also, you should put the Mirror modifier above the Subsurface modifier.


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