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I know that SZ0 makes vertices straightened on the z-axis, but I'm wondering if there's a way to make vertices into a complete circle on the z-axis with a hotkey?

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  • $\begingroup$ try to click a vertice in edit mode with Alt pressed $\endgroup$ – cxnt Feb 13 at 6:34
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You can also use the To Sphere function for that.
When used with a 2D mesh it makes a circle.

Mesh > Transform > To sphere
Shortcut: Shift+Alt+S and press 1 for a full circle.

enter image description here

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    $\begingroup$ +1 for showing basic built-int and read to use option instead of attacking the user with multitude of addons just for a simple task. $\endgroup$ – internetofmine Feb 13 at 12:57
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    $\begingroup$ Thanks, I also like simple solutions :). Still, those suggested addons offer more functionality. $\endgroup$ – Jachym Michal Feb 13 at 13:33
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    $\begingroup$ I have never seen this before: (Mesh > Transform > To Sphere). Thank you for sharing. My thumb up. $\endgroup$ – Rita Geraghty stands by Monica Feb 13 at 13:45
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There's an add-on called "mesh tiny cad" which is still included in the standard installation of Blender (2.79 and 2.8+).

  • Pick any three vertices in Edit Mode
  • RMB -> TinyCad -> CCEN,

You'll see a circle of verts which you can adjust (radius, num of new verts)

This add-on/operator doesn't care about the orientation of your three vertices, it's not limited to X,Y or Z axis. It can be an arbitrary plane.

enter image description here

small documentation page for the add-on: https://zeffii.github.io/mesh_tiny_cad/

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    $\begingroup$ Thanks for all the effort you put into this addon. I'd like using it more frequently but I always ran into this issue that can't imagine what this cool abbreviations like "CCEN" or "VTX" are actually doing. Is there any documentation to get a better understanding of the operators? $\endgroup$ – brockmann Feb 13 at 11:19
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    $\begingroup$ sure: zeffii.github.io/mesh_tiny_cad $\endgroup$ – zeffii Feb 13 at 11:22
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    $\begingroup$ On behalf of everyone: Thank you for making TinyCAD! :) $\endgroup$ – Jachym Michal Feb 13 at 19:32
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    $\begingroup$ @JachymMichal and brockmann having tinycad out there is entirely selfish :) it's the ultimate form of backup :) $\endgroup$ – zeffii Feb 13 at 21:17
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enter image description here

Please See Loop Tools. Please Click on the image to see a larger image.

This is an addon which may take 33 seconds to install from User Preferences. In the later version of Blender the addon appears with the context menu. (Click with the other mouse button) Now that you know the name of the addon you can see videos about how to use it on the famous video website or exactly here by searching BSE.

I have used some of the other techniques in past and present, presented in the other answers. They work well. Loop Tools has many interesting features which go beyond the scope of your question for your future endeavors. There are always 33 ways to do something in Blender.

Some images which may be from an earlier version of Blender.

enter image description here A well populated cube with a hole and then loop tools was used. enter image description here The menu location of Loop Tools in an earlier version. enter image description here Loop Tools was enabled in User Preferences in this earlier version.

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