Port

code/game/objects/items/circuitboards/machine_circuitboards.dm

@@ -308,6 +308,7 @@
 /obj/item/circuitboard/machine/thermomachine
 	name = "Thermomachine (Machine Board)"
 	desc = "You can use a screwdriver to switch between heater and freezer."
+	var/pipe_layer = PIPING_LAYER_DEFAULT
 	req_components = list(
 		/obj/item/stock_parts/matter_bin = 2,
 		/obj/item/stock_parts/micro_laser = 2,
@@ -342,8 +343,18 @@
 		build_path = initial(new_type.build_path)
 		I.play_tool_sound(src)
 		to_chat(user, "<span class='notice'>You change the circuitboard setting to \"[new_setting]\".</span>")
-	else
-		return ..()
+		return
+
+	if(I.tool_behaviour == TOOL_MULTITOOL)
+		pipe_layer = (pipe_layer >= PIPING_LAYER_MAX) ? PIPING_LAYER_MIN : (pipe_layer + 1)
+		to_chat(user, "<span class='notice'>You change the circuitboard to layer [pipe_layer].</span>")
+		return
+
+	. = ..()
+
+/obj/item/circuitboard/machine/thermomachine/examine()
+	. = ..()
+	. += "<span class='notice'>It is set to layer [pipe_layer].</span>"
 
 /obj/item/circuitboard/machine/thermomachine/heater
 	name = "Heater (Machine Board)"