Why can't I extrude this face?

bryan_henry416 · March 8

Took a short recording of my attempt to Extrude a face that was just created using Thicken:

https://www.youtube.com/watch?v=e9Q4MIhujpo

As you can see there, I can select the face (and it's called a "face") when I don't have Extrude selected, but can't select the face when setting up an Extrude. I don't see any particular indication that the face or part is different in some way. It looks shaded so its a solid part, right? Anyone know why I'm not able to Extrude this face? I can actually also select the face if I start a 2nd Thicken operation, but not Extrude.

If I'm missing any particular obvious indication I may just not be aware of it, so feel free to call any of those out. :)

CADNurd · March 8

Thicken works on non-planar faces whereas Extrude does not. Most likely the surface you thickened is just ever-so-slightly non-planar.

Example . . .

https://cad.onshape.com/documents/071aae879fa7ec3114d732e1/w/0ddc3e89bd92980cf7e06756/e/a61c9adc7bc65e127498cecc?renderMode=0&uiState=69ad83545e52657494beb87b

Why can't I extrude this face?

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