Port

code/game/machinery/constructable_frame.dm

@@ -181,6 +181,9 @@
 				if(component_check)
 					P.play_tool_sound(src)
 					var/obj/machinery/new_machine = new circuit.build_path(loc)
+					if(new_machine.circuit)
+						QDEL_NULL(new_machine.circuit)
+					new_machine.circuit = circuit
 					new_machine.setAnchored(anchored)
 					new_machine.on_construction()
 					for(var/obj/O in new_machine.component_parts)
@@ -189,9 +192,6 @@
 					for(var/obj/O in src)
 						O.moveToNullspace()
 						new_machine.component_parts += O
-					if(new_machine.circuit)
-						QDEL_NULL(new_machine.circuit)
-					new_machine.circuit = circuit
 					circuit.moveToNullspace()
 					new_machine.RefreshParts()
 					qdel(src)

code/game/machinery/pipe/construction.dm

@@ -75,8 +75,7 @@ Buildable meters
 		new_layer = PIPING_LAYER_DEFAULT
 	piping_layer = new_layer
 
-	pixel_x += (piping_layer - PIPING_LAYER_DEFAULT) * PIPING_LAYER_P_X
-	pixel_y += (piping_layer - PIPING_LAYER_DEFAULT) * PIPING_LAYER_P_Y
+	PIPING_LAYER_SHIFT(src, piping_layer)
 	layer = initial(layer) + ((piping_layer - PIPING_LAYER_DEFAULT) * PIPING_LAYER_LCHANGE)
 
 /obj/item/pipe/proc/update()
@@ -232,5 +231,4 @@ Buildable meters
 
 /obj/item/pipe_meter/proc/setAttachLayer(new_layer = PIPING_LAYER_DEFAULT)
 	piping_layer = new_layer
-	pixel_x = (new_layer - PIPING_LAYER_DEFAULT) * PIPING_LAYER_P_X
-	pixel_y = (new_layer - PIPING_LAYER_DEFAULT) * PIPING_LAYER_P_Y
+	PIPING_LAYER_DOUBLE_SHIFT(src, piping_layer)

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)"