diff --git a/basic_machines/electronic_fab.lua b/basic_machines/electronic_fab.lua
index e6a2640..1ef1934 100644
--- a/basic_machines/electronic_fab.lua
+++ b/basic_machines/electronic_fab.lua
@@ -77,8 +77,9 @@ local function making(pos, crd, nvm, inv)
 	local owner = M(pos):get_string("owner")
 	local rtype = RecipeType[crd.stage]
 	local recipe = recipes.get(nvm, rtype, owner)
-	local output = ItemStack(recipe.output.name.." "..recipe.output.num)
-	if inv:room_for_item("dst", output) then
+	local output = ItemStack(recipe.output.name .. " " .. recipe.output.num)
+	local waste = recipe.waste and ItemStack(recipe.waste.name .. " " .. recipe.waste.num)
+	if inv:room_for_item("dst", output) and (not waste or inv:room_for_item("dst", waste)) then
 		for _,item in ipairs(recipe.input) do
 			local input = ItemStack(item.name.." "..item.num)
 			if not inv:contains_item("src", input) then
@@ -91,6 +92,9 @@ local function making(pos, crd, nvm, inv)
 			inv:remove_item("src", input)
 		end
 		inv:add_item("dst", output)
+		if waste then
+			inv:add_item("dst", waste)
+		end
 		crd.State:keep_running(pos, nvm, COUNTDOWN_TICKS)
 		return
 	end
diff --git a/items/electronic.lua b/items/electronic.lua
index 1f54551..796fda5 100644
--- a/items/electronic.lua
+++ b/items/electronic.lua
@@ -51,11 +51,13 @@ minetest.register_craftitem("techage:ta5_aichip2", {
 
 techage.recipes.add("ta2_electronic_fab", {
 	output = "techage:vacuum_tube 2",
+	waste = "basic_materials:empty_spool 1",
 	input = {"default:glass 1", "basic_materials:copper_wire 1", "basic_materials:plastic_sheet 1", "techage:usmium_nuggets 1"}
 })
 
 techage.recipes.add("ta3_electronic_fab", {
 	output = "techage:vacuum_tube 2",
+	waste = "basic_materials:empty_spool 1",
 	input = {"default:glass 1", "basic_materials:copper_wire 1", "basic_materials:plastic_sheet 1", "techage:usmium_nuggets 1"}
 })
 
@@ -81,17 +83,20 @@ techage.recipes.add("ta4_electronic_fab", {
 
 techage.recipes.add("ta4_electronic_fab", {
 	output = "techage:ta4_leds 8",
+	waste = "basic_materials:empty_spool 1",
 	input = {"basic_materials:plastic_sheet 4", "basic_materials:copper_wire 1", "techage:ta4_silicon_wafer 1"}
 })
 
 techage.recipes.add("ta4_electronic_fab", {
 	output = "techage:ta5_aichip 2",
+	waste = "basic_materials:empty_spool 2",
 	input = {"techage:ta4_leds 8", "basic_materials:copper_wire 1", "basic_materials:gold_wire 1", "techage:ta4_silicon_wafer 1"},
 	ex_points = 10,
 })
 
 techage.recipes.add("ta4_electronic_fab", {
 	output = "techage:ta5_aichip2 2",
+	waste = "basic_materials:empty_spool 2",
 	input = {"techage:ta4_leds 8", "basic_materials:copper_wire 1", "basic_materials:gold_wire 1", "techage:ta4_silicon_wafer 1"},
 	ex_points = 50,
 })