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wrong train of thought on edge extrude ?

Hello,
I wanted to make a ridge / wall / thin extrude on some of my edge of a face.
it doesn't seem possible to only select the edges that I want , and onshape only makes it possible to select the face while I'm in extrude mode.
what is the correct way of doing this ?
0
Answers
Create a sketch. Use the Use tool or Intersection tool to bring surfaces into your sketch. Then you can extrude.
This would be my solution, using my Polypipe FS.
https://cad.onshape.com/documents/ce10a9dface7a63c9f00b39c/w/9af161fc5e9a35a63df58e4d/e/838d19d725a73a3d93515dfd?renderMode=0&uiState=67e45e8c7c7ea7504ab8c7e8
—Eldonb
This alternative 'extrude' FS allows selection of edges. preventing having to make useless sketches with only used edges.