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I'm new to blender (and in fact modelling in general) and I don't know the controls. I think at one point I must have toggled something wrong and now instead of dragging vertices around right mouse button extrudes from whatever is selected.
In addition selecting a vertex and trying to move it manually with the X/Y/Z transform boxes also extrudes.

Does anyone know what I've done and how to reverse it?

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  • $\begingroup$ It's hard to say what happens really. normal controls are G for grab (moving vertices/edges/feces) and E for extrusions. right clicking allow you to select but Ctrl+right click does extrusion. Try to check your Ctrl key $\endgroup$ – Bithur Feb 15 '15 at 2:37
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    $\begingroup$ Blender has no auto extrude functionality like that. Unless your keys are faulty or sticking, most possible scenario is that you might have duplicate faces/verts and or have proportional editing on. Or since you are new, it might just be proportional editing you are confusing with extrusion. A video/gif if possible would be nice or save the file you are in and upload it to pasteall.org/blend and share the link here. $\endgroup$ – iKlsR Feb 15 '15 at 2:39
  • $\begingroup$ You can also try 'File->Load Factory Settings' $\endgroup$ – MarcClintDion Feb 15 '15 at 3:58
  • $\begingroup$ yes it turns out i had many duplicate vertexes. thanks @iKlsR $\endgroup$ – mattihase Feb 15 '15 at 10:03
  • $\begingroup$ +1 for sticky keys - Ctrl-Click performs an extrude of selection. Maybe check for sticky keys in system controls. $\endgroup$ – sambler Feb 15 '15 at 10:03
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Blender has no auto extrude functionality like what you describe to my knowledge. Based on your description, the most likely culprits are.

  1. Duplicate vertices, to fix, Tab into Edit mode and perform a Remove Doubles operation from the W specials menu.

  2. Proportional Editing, this is usually indicated by a circle that shows the region being affected, check your view header for a blue icon/toggle this with O. See Why is an object stuck to another?

Or it could be a combination of both of the above.

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