That is correct 2Dcube.
Im allmost done with the mould. But I cant seem to trim my upper part of the mould into the solid block I made. I’ve uploaded my file. im trying to make my blue part the cutting object and the red block the part that is getting trimmed. Maybe you know how. It seemed to work on mould below, I dont know why the same trick doesnt work again. Hydrofoil 5 - mould.3dm (2.6 MB)