How do I edit an object imported as an STL file?

frank_paynter
frank_paynter Member Posts: 34 ✭✭

servo_mount_disc (1).stl | servo_mount_disc (1)

I have an STL model I imported, and I want to remove the flange, leaving only the cylinder with interior teeth. I tried adding a cylinder and using the Boolean function, but that doesn't seem to work. Can anyone tell me what I'm doing wrong?

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