Index: mesh.c
===================================================================
--- mesh.c	(revision 32055)
+++ mesh.c	(revision 32056)
@@ -645,9 +645,12 @@
 	for(gid = 0; gid < PCB->LayerGroups.len; gid++) {
 		pcb_layergrp_t *grp = &PCB->LayerGroups.grp[gid];
 		if (grp->ltype & PCB_LYT_COPPER) {
+			/* For now follow the old behavior and ignore the thickness of copper layers for now: copper sheets are modelled in 2d */
+#if 0
 			rnd_coord_t th = mesh_layergrp_thickness(grp, mesh->def_copper_thick);
 			y += th;
 			ybottom = y;
+#endif
 		}
 		else if (grp->ltype & PCB_LYT_SUBSTRATE) {
 			rnd_coord_t d, t = mesh_layergrp_thickness(grp, mesh->def_subs_thick);