I create this pipe kind of thing from curve->bevel.
Then convert it to mesh. I want to continue slight extrusion at the end which looks in the continuation only. It is not along any axis. How to manage this extrusion?

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Jehan
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if you cylinder is hollow I'm not sure you can except if you fill the face, then extrude, in that case don't forget to delete the inner face. But you could slide the selection along the edges with GG, then C to extend the slide, and add an edge loop where your edge loop was initially – moonboots Oct 31 '20 at 12:50
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Can also create a custom orientation (select the edges, add the custom orientation, then E and X). – lemon Oct 31 '20 at 12:57
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1https://blender.stackexchange.com/a/127747/35559 to slide, followed by cutting in an edge loop. – Robin Betts Oct 31 '20 at 13:02
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Thank you everyone for your help. Custom orientation is still mystery for me @lemon – Jehan Oct 31 '20 at 16:25
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@Jehan, you can create an orientation from a selection: https://docs.blender.org/manual/en/latest/editors/3dview/controls/orientation.html#custom-orientations . and use it as new axis orientation. – lemon Oct 31 '20 at 16:28
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@moonboots I think Robin's solution works well in this case. – Jehan Oct 31 '20 at 17:05
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@lemon let me try for it. :) I have to learn it so, why not now! Thanks for help. – Jehan Oct 31 '20 at 17:07
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yes that's was I was talking about (GG then C) ;) – moonboots Oct 31 '20 at 17:07
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@lemon, not sure what you mean, I think it won't work if his cylinder is hollow (no face), and if it is not, the extrusion will follow the normals by default – moonboots Oct 31 '20 at 17:10
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@moonboots, it works even if hollow. Though, retesting it following your comment, the axis is not always the same (not always X, for instance). GG and C is not the same (no extrusion, a direction per vertex)... but could be what is wanted here. Don't know. – lemon Oct 31 '20 at 17:16
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@moonboots ahh my bad... I thought that fill face was also in its continuation.. – Jehan Oct 31 '20 at 17:17
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@lemon I can't make it work with a hollow circle, I don't know why – moonboots Oct 31 '20 at 17:19
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@moonboots, tested it again and does not work now... mmm... – lemon Oct 31 '20 at 17:27
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@lemon, it never worked for me – moonboots Oct 31 '20 at 17:29
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@moonboots, ok... strange. Bezier curve, bevel, convert to mesh. From top view, rotate and apply rotation. Select a circle at extremity, etc. And here it works. Though effectively not in another configuration... never noticed that. So globally, you are right. But if you select only 3 vertices, it is ok (Blender see that as a face). – lemon Oct 31 '20 at 17:40