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Hollow Extrude

in General
Hi
I have a sketch and extrude in folder Motorshaft which is extruding a solid, but i need the same to be hollow so that nema 17 shaft fits into it. How do this please.request to modify sketch / extrude
https://cad.onshape.com/documents/6d793abbb963f9ad6cc54868/w/e38ce0f1912831c751f4d4aa/e/39fb17897c91737aadf6c591?renderMode=0&uiState=67fbb21f351bef6c1a96c6cd
0
Comments
As in this document, revise Sketch Motorshaft to include a 5mm circle concentric to the one you already have and draw a line (who's ends intersect the circle) across the circle at a distance of 2mm from the circle's center. Extrude the proper sketch faces upward. - Scotty
Thank you