So I'm 3d modeling a logo and there's one oddly shaped part that needs to be extruded. I am trying to use the knife tool to cut it out, but every time I finish it deletes the face. In the operator I can see the option that I obviously need to change, but it's grayed out saying redo unsupported. What do I do?

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    $\begingroup$ Knife tool is interactive one so you change its options while it's activated (i.e. before confirm). Still I'm not sure why it deletes the face once cut is finished. Could you add example screenshot ? $\endgroup$ – Mr Zak Mar 13 '16 at 16:20

N-gons with a hole

Currently holed-ngons (e.g. a doughnut section) are not supported. If in the cutting process you are creating one of those, the software will try its best in finding a way to continue anyway (in this case by splitting the ngon in two and as a side effect deleting th inner face).

In the picture below you can see the difference of behaviour of the command upon the same mesh but with different topology:

enter image description here

I suggest to continue knife projecting the shape as you were doing and then simply re-fill the boundary with a new face. Just select the hole boundary and press F or with another method (e.g. fill holes operator).

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