Hi. I'm trying to stitch up some faces to form a volume but i get a error message ACIS error 52000: All faces are used twice (Is this an open shell?) May i know what mistake i had made???? I had checked that it is a closed region. I had also got error message saying that i can't use face.546 as it is linked for meshing. But i had unlinked the face mesh but it doesn't help. So i copy this same face and use it to stitich up the volume. But the problem persists.

Thanks Regards

Is face.546 sharing an edge or connected to another face which is linked for meshing? If so you'll have to unlink those also.

Mark