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I'm making a studio monitor and i'm having trouble with the face selection, vertex. I'm pretty new to blender and 3d, so i think this must be a pretty common error.

Here is the mesh, i want to select the faces were are triangles so i can make them quads enter image description here

But this happens every time i try to select the face, it select the hole section. enter image description here

And this is how it looks out of edit mode, full of black lines enter image description here

This i what happens when i try selecting the vertex of the triangle and using subdivide

enter image description here

enter image description here

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Instead of creating triangles and trying to fix them later, keep your topology using quads all the time.

It is a common misconception that the topology of an object comes at the end of the process. The topology of the object should always be worked out from the beginning.

A simplified way to do a speaker:

Start with a cube, scale it on the $Z$ axis, and make a loop cut in the middle.

enter image description here

enter image description here

Position the cut to divide the two main sections of the speaker.

Create some vertical loop cuts And subdivide each of the sections with an equal amount of cuts.

enter image description here

select the edges that will become the round part and press ⇧ Shift+⎇ Alt+S (to sphere) and move the mouse to create a circular shape.

enter image description here

Do the same for the top part.

enter image description here

Select the central faces to extrude.

enter image description here

If you select the loop ring in the front you should be able to bevel the holes.

enter image description here

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You have overlapping faces - in Face Select mode (as in your example images) this is evident as the ‘dot’ for each face is not in the centre of the face. For example, the elongated triangles near the top have their ‘dot’ near to one corner, while towards the middle it coincides with an edge. Select those faces and remove them with X and select Faces Only.

When creating new faces ensure you only select the nearest vertices so as to not overlap with other geometry. You could also try Space and ‘Remove Doubles’ while all faces are selected.

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  • $\begingroup$ I tried remove doubles, but it wont work. I have to delete the hole face and start joining the vertex together with F, as far as it goes is working but it takes time. When i delete the big face, behind are vertex without faces $\endgroup$ – Misha Lepes Mar 31 '18 at 20:31
  • $\begingroup$ @MishaLepes Use of Remove Doubles will depend on the cause of the overlapping faces as it only affects duplicated vertices. If the problem is due to overlapping faces only (using the exact same vertices) then it won’t help. However, it is worth trying anyway. $\endgroup$ – Rich Sedman Mar 31 '18 at 21:04

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