Index: export_openscad.c
===================================================================
--- export_openscad.c	(revision 37787)
+++ export_openscad.c	(revision 37788)
@@ -84,7 +84,10 @@
 static vti0_t scad_comp;
 static const char *scad_prefix = "pcb";
 static double board_thickness = 1.6;
+static int scad_doing_top_copper, scad_doing_bot_copper;
+static double scad_top_copper_elev, scad_bot_copper_elev;
 
+
 static rnd_hid_attr_val_t *openscad_options;
 
 static const rnd_export_opt_t openscad_attribute_list[] = {
@@ -306,6 +309,8 @@
 	fprintf(f, "		translate([0,0,%f]) {\n", h);
 	layer_open = 1;
 
+	if (scad_doing_top_copper) scad_top_copper_elev = h + layer_thickness;
+	if (scad_doing_bot_copper) scad_bot_copper_elev = h - layer_thickness;
 }
 
 
@@ -366,6 +371,10 @@
 			board_thickness = RND_COORD_TO_MM(pcb_stack_thickness(PCB, "openscad", PCB_BRDTHICK_PRINT_ERROR, from, 1, to, 0, PCB_LYT_SUBSTRATE|PCB_LYT_COPPER));
 		else
 			board_thickness = 1.6;
+
+		/* fallback if we didn't figure real copper layer elevation during layer render */
+		scad_top_copper_elev =+board_thickness/2.0;
+		scad_bot_copper_elev =-board_thickness/2.0;
 	}
 
 	pcb_cam_begin_nolayer(PCB, &cam, NULL, options[HA_cam].str, &filename);
@@ -391,12 +400,13 @@
 	gds_init(&model_calls);
 	vti0_init(&scad_comp);
 
-	if (options[HA_models].lng)
-		scad_insert_models();
 
 	openscad_hid_export_to_file(design, f, options);
 	scad_close_layer_group();
 
+	if (options[HA_models].lng)
+		scad_insert_models();
+
 	if (options[HA_drill].lng)
 		scad_draw_drills();
 
@@ -425,6 +435,8 @@
 
 static int openscad_set_layer_group(rnd_hid_t *hid, rnd_design_t *design, rnd_layergrp_id_t group, const char *purpose, int purpi, rnd_layer_id_t layer, unsigned int flags, int is_empty, rnd_xform_t **xform)
 {
+	scad_doing_top_copper = scad_doing_bot_copper = 0;
+
 	if (flags & PCB_LYT_UI)
 		return 0;
 
@@ -471,10 +483,12 @@
 		}
 		if (flags & PCB_LYT_TOP) {
 			scad_new_layer_group("top_copper", +1, openscad_options[HA_copper_color].str);
+			scad_doing_top_copper = 1;
 			return 1;
 		}
 		if (flags & PCB_LYT_BOTTOM) {
 			scad_new_layer_group("bottom_copper", -1, openscad_options[HA_copper_color].str);
+			scad_doing_bot_copper = 1;
 			return 1;
 		}
 	}
Index: scad_models.c
===================================================================
--- scad_models.c	(revision 37787)
+++ scad_models.c	(revision 37788)
@@ -84,7 +84,7 @@
 	if (ref != NULL) {
 		char tab[] = "\t\t\t\t\t\t\t\t";
 		int ind = 0;
-		rnd_append_printf(&model_calls, "	translate([%mm,%mm,%f])\n", x0, y0, on_bottom ? -board_thickness/2.0 : +board_thickness/2.0);
+		rnd_append_printf(&model_calls, "	translate([%mm,%mm,%f])\n", x0, y0, on_bottom ? scad_bot_copper_elev : scad_top_copper_elev);
 		ind++;
 		tab[ind] = '\0';