diff --git a/hardware/transmitter/enclosure/Makefile b/hardware/transmitter/enclosure/Makefile
index c4061c2..c8f01d1 100644
--- a/hardware/transmitter/enclosure/Makefile
+++ b/hardware/transmitter/enclosure/Makefile
@@ -184,7 +184,8 @@ $(RENDER_DIR)/assembly/exploded_%.png: assembly.scad $$(SCAD_DEPS)
 clean:
 	rm -rf $(foreach s,$(STEMS),$(RENDER_DIR)/$(s))
 
-clean-all: clean
+clean-all:
+	rm -rf $(RENDER_DIR)
 
 # ─── Information ──────────────────────────────────────────────────────────────
 
@@ -204,7 +205,8 @@ help:
 	@echo "  all / renders        Render all parts in all views  ($(words $(ALL_PNGS)) images)"
 	@echo "  stl                  Export all parts as STL        ($(words $(ALL_STLS)) files)"
 	@echo "  assembly-exploded    Exploded assembly renders"
-	@echo "  clean                Remove all generated files"
+	@echo "  clean                Remove per-part render directories"
+	@echo "  clean-all            Remove entire $(RENDER_DIR)/ directory"
 	@echo "  list-parts           Show auto-discovered parts"
 	@echo "  help                 Show this help"
 	@echo ""
diff --git a/hardware/transmitter/enclosure/modules/module_zone.scad b/hardware/transmitter/enclosure/modules/module_zone.scad
index 5e652a6..151f603 100644
--- a/hardware/transmitter/enclosure/modules/module_zone.scad
+++ b/hardware/transmitter/enclosure/modules/module_zone.scad
@@ -38,8 +38,8 @@ module module_zone() {
     h = zone_height;
 
     // Grid position (centered on X, centered on Y)
-    grid_w = bay_grid_cols * (bay_unit_size + bay_wall) + bay_wall;
-    grid_d = bay_grid_rows * (bay_unit_size + bay_wall) + bay_wall;
+    grid_w = bay_grid_width;
+    grid_d = bay_grid_height;
     grid_x = (w - grid_w) / 2;
     grid_y = (d - grid_d) / 2;