I have a bit of an odd question here. Let say I create a 3D model of a pipe a pipe with ID 100mm and 1000mm length. I then fill it with spheres (16mm in diameter). I'll just place the spheres in the pipe one by one and add all the mates manually. This is the easy part though quite time consuming. The real question here is is there a way to then extract the void space between the spheres and extract it as a solid model removing the spheres and the pipe themselves? I'm currently using SW2017 if that matters.