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How do I extrude my cylinder using a mirror modifier to extrude perfectly straight to form a circle at the top instead of closing out and forming a center bridge?

enter image description here

I tried changing the orientational to normal and using other origin points, but not sure how to do it properly.

I want it to extrude perfectly together so it forms a circle.

If i use clipping it forms a oval shape enter image description here

Update: My only solution was to extrude + scale using clipping, then use the loop cut add on and choose circle.

Is there not an easier way to do the same thing?

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2 Answers 2

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Choose 3D Cursor in the Transform Pivot Point panel and put the 3D cursor at the center of your circle:

enter image description here

enter image description here

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  • $\begingroup$ when I do that it extrudes in the center, except it's along the z-axis so from top view it looks good, but on side view it extrudes downwards $\endgroup$
    – makerbaker
    Commented Mar 21, 2022 at 9:22
  • $\begingroup$ are you sure that the 3D cursor is correctly placed? please share your file: pasteall.org/blend $\endgroup$
    – moonboots
    Commented Mar 21, 2022 at 9:28
  • $\begingroup$ oh i was but my object was above on the z axis and that's why it was tryin to move downwards $\endgroup$
    – makerbaker
    Commented Mar 21, 2022 at 9:36
  • $\begingroup$ the only issue is if I want to scale the top part of my cylinder the same way then that causes issues $\endgroup$
    – makerbaker
    Commented Mar 21, 2022 at 9:39
  • $\begingroup$ what do you mean? if you want to scale both the top and bottom edge at the same time, as Kuboa explains, constraint on the Z axis with Shift Z $\endgroup$
    – moonboots
    Commented Mar 21, 2022 at 9:45
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If you're working with a half-cylinder as base mesh, you can choose 3D Cursor as the pivot point (with 3D Cursor at the center of your cylinder) and extrude, then scale. It starts extruding downwards at an angle at first, but you can fix that by pressing Shift+Z to exclude Z from the transformation:

enter image description here

If you're working with a full cylinder as base mesh, you can leave your pivot at Median Point (3D Cursor would also work) but select the whole circle before extruding:

enter image description here

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