Screw commit history.

code/modules/integrated_electronics/core/assemblies.dm

@@ -9,7 +9,7 @@
 	icon = 'icons/obj/assemblies/electronic_setups.dmi'
 	icon_state = "setup_small"
 	item_flags = NOBLUDGEON
-	materials = list()		// To be filled later
+	custom_materials = null		// To be filled later
 	datum_flags = DF_USE_TAG
 	var/list/assembly_components = list()
 	var/list/ckeys_allowed_to_scan = list() // Players who built the circuit can scan it as a ghost.
@@ -95,9 +95,9 @@
 			D.open()
 
 /obj/item/electronic_assembly/Initialize()
+	LAZYSET(custom_materials, /datum/material/iron, round((max_complexity + max_components) * 0.25) * SScircuit.cost_multiplier)
 	.=..()
 	START_PROCESSING(SScircuit, src)
-	materials[MAT_METAL] = round((max_complexity + max_components) / 4) * SScircuit.cost_multiplier
 
 	//sets up diagnostic hud view
 	prepare_huds()

code/modules/integrated_electronics/core/integrated_circuit.dm

@@ -4,7 +4,7 @@
 	icon = 'icons/obj/assemblies/electronic_components.dmi'
 	icon_state = "template"
 	w_class = WEIGHT_CLASS_TINY
-	materials = list()				// To be filled later
+	custom_materials = null				// To be filled later
 	var/obj/item/electronic_assembly/assembly // Reference to the assembly holding this circuit, if any.
 	var/extended_desc
 	var/list/inputs = list()
@@ -84,7 +84,7 @@ a creative player the means to solve many problems.  Circuits are held inside an
 	setup_io(inputs, /datum/integrated_io, inputs_default, IC_INPUT)
 	setup_io(outputs, /datum/integrated_io, outputs_default, IC_OUTPUT)
 	setup_io(activators, /datum/integrated_io/activate, null, IC_ACTIVATOR)
-	materials[MAT_METAL] = w_class * SScircuit.cost_multiplier
+	LAZYSET(custom_materials, /datum/material/iron, w_class * SScircuit.cost_multiplier)
 	. = ..()
 
 /obj/item/integrated_circuit/proc/on_data_written() //Override this for special behaviour when new data gets pushed to the circuit.

code/modules/integrated_electronics/core/printer.dm

@@ -33,7 +33,8 @@
 
 /obj/item/integrated_circuit_printer/Initialize()
 	. = ..()
-	AddComponent(/datum/component/material_container, list(MAT_METAL), MINERAL_MATERIAL_AMOUNT * 25, TRUE, list(/obj/item/stack, /obj/item/integrated_circuit, /obj/item/electronic_assembly))
+	var/datum/component/material_container/materials = AddComponent(/datum/component/material_container, list(/datum/material/iron), MINERAL_MATERIAL_AMOUNT * 25, TRUE, list(/obj/item/stack, /obj/item/integrated_circuit, /obj/item/electronic_assembly))
+	materials.precise_insertion = TRUE
 
 /obj/item/integrated_circuit_printer/proc/print_program(mob/user)
 	if(!cloning)
@@ -189,16 +190,16 @@
 		var/cost = 400
 		if(ispath(build_type, /obj/item/electronic_assembly))
 			var/obj/item/electronic_assembly/E = SScircuit.cached_assemblies[build_type]
-			cost = E.materials[MAT_METAL]
+			cost = E.custom_materials[getmaterialref(/datum/material/iron)]
 		else if(ispath(build_type, /obj/item/integrated_circuit))
 			var/obj/item/integrated_circuit/IC = SScircuit.cached_components[build_type]
-			cost = IC.materials[MAT_METAL]
+			cost = IC.custom_materials[getmaterialref(/datum/material/iron)]
 		else if(!(build_type in SScircuit.circuit_fabricator_recipe_list["Tools"]))
 			return
 
 		var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
 
-		if(!debug && !materials.use_amount_type(cost, MAT_METAL))
+		if(!debug && !materials.use_amount_mat(cost, /datum/material/iron))
 			to_chat(usr, "<span class='warning'>You need [cost] metal to build that!</span>")
 			return TRUE
 
@@ -270,14 +271,14 @@
 					return
 				else if(fast_clone)
 					var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-					if(debug || materials.use_amount_type(program["metal_cost"], MAT_METAL))
+					if(debug || materials.use_amount_mat(program["metal_cost"], /datum/material/iron))
 						cloning = TRUE
 						print_program(usr)
 					else
 						to_chat(usr, "<span class='warning'>You need [program["metal_cost"]] metal to build that!</span>")
 				else
 					var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-					if(!materials.use_amount_type(program["metal_cost"], MAT_METAL))
+					if(!materials.use_amount_mat(program["metal_cost"], /datum/material/iron))
 						to_chat(usr, "<span class='warning'>You need [program["metal_cost"]] metal to build that!</span>")
 						return
 					var/cloning_time = round(program["metal_cost"] / 15)
@@ -295,7 +296,7 @@
 				to_chat(usr, "<span class='notice'>Cloning has been canceled. Metal cost has been refunded.</span>")
 				cloning = FALSE
 				var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-				materials.use_amount_type(-program["metal_cost"], MAT_METAL) //use negative amount to regain the cost
+				materials.use_amount_mat(-program["metal_cost"], /datum/material/iron) //use negative amount to regain the cost
 
 
 	interact(usr)

code/modules/integrated_electronics/core/saved_circuits.dm

@@ -260,7 +260,7 @@
 	blocks["max_space"] = assembly.max_components
 
 	// Start keeping track of total metal cost
-	blocks["metal_cost"] = assembly.materials[MAT_METAL]
+	blocks["metal_cost"] = assembly.custom_materials[getmaterialref(/datum/material/iron)]
 
 
 	// Block 2. Components.
@@ -291,7 +291,7 @@
 		// Update estimated assembly complexity, taken space and material cost
 		blocks["complexity"] += component.complexity
 		blocks["used_space"] += component.size
-		blocks["metal_cost"] += component.materials[MAT_METAL]
+		blocks["metal_cost"] += component.custom_materials[getmaterialref(/datum/material/iron)]
 
 		// Check if the assembly requires printer upgrades
 		if(!(component.spawn_flags & IC_SPAWN_DEFAULT))