<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Javier,<div><br></div><div>I've modified your geometry so that you see how to include the holes, whether you consider a volume sheet or a surface. </div><div>The idea is that all the basic geometrical entities are embedded in the rest.</div><div>You can use extrusion, as you did, but carefully: you should avoid defining lines/surfaces that will re-appear when extruding. That's asking for troubles when meshing.</div><div><br></div><div>The attached file contains only the volume iron sheet with holes, the rest is yet to be connected.</div><div><br></div><div>HTH,</div><div>Ruth</div><div><br></div><div></div></body></html>