Hi,
anyone knwo why this isnt a valid polysurface or why I cant split it ot trim it? trying to create a ‘crown’ effect on the white barrel
the second link
Half of your trim surfaces are polysurfaces with 2 identical faces on top of each other. If you click on them you will see every second one is a polysurface. You need to explode those and delete the duplicate surfaces (you can select them with SelDup command). Then join all the surfaces into one and use that to trim the cylinder. Then it works.
Thankyou !!!