nGood to see you found a solution. This is in general a limitation or oversight with the way mechanical handles assembled models. Composites do not form a considerable part of my work, so this is the first example that has really highlighted this issue with the ACP workflow, that you are essentially forced straight into using an assembly system. This issue arises with other models also, but the solution most of the time is to model as much as possible before assembly. In future releases the assembly workflow should become a bit more flexible, allowing users to add/modify geometry and meshes a bit more freely. (fingers crossed)nHaving looked at your model though another solution may also have been to mesh the rollers coarsely, then use contact geometry correction to ensure the contact behaved as a perfect cylinder.nn