diff --git a/code/modules/research/machinery/_production.dm b/code/modules/research/machinery/_production.dm
index 3cef3a0b84..26e2eaef2d 100644
--- a/code/modules/research/machinery/_production.dm
+++ b/code/modules/research/machinery/_production.dm
@@ -73,6 +73,11 @@
 		materials.max_amount = 0
 		for(var/obj/item/stock_parts/matter_bin/M in component_parts)
 			materials.max_amount += M.rating * 75000
+	var/total_rating = 0
+	for(var/obj/item/stock_parts/manipulator/M in component_parts)
+		total_rating += M.rating
+	total_rating = max(1, total_rating)
+	efficiency_coeff /= total_rating
 
 //we eject the materials upon deconstruction.
 /obj/machinery/rnd/production/on_deconstruction()
@@ -234,9 +239,9 @@
 		t = check_mat(D, M)
 		temp_material += " | "
 		if (t < 1)
-			temp_material += "<span class='bad'>[all_materials[M]*coeff] [CallMaterialName(M)]</span>"
+			temp_material += "<span class='bad'>[all_materials[M]/coeff] [CallMaterialName(M)]</span>"
 		else
-			temp_material += " [all_materials[M]*coeff] [CallMaterialName(M)]"
+			temp_material += " [all_materials[M]/coeff] [CallMaterialName(M)]"
 		c = min(c,t)
 
 	if (c >= 1)
diff --git a/code/modules/research/machinery/circuit_imprinter.dm b/code/modules/research/machinery/circuit_imprinter.dm
index 3a56850a2f..e51b1c5cf5 100644
--- a/code/modules/research/machinery/circuit_imprinter.dm
+++ b/code/modules/research/machinery/circuit_imprinter.dm
@@ -20,13 +20,6 @@
 	production_animation = "circuit_imprinter_ani"
 	allowed_buildtypes = IMPRINTER
 
-/obj/machinery/rnd/production/circuit_imprinter/calculate_efficiency()
-	. = ..()
-	var/T = 0
-	for(var/obj/item/stock_parts/manipulator/M in component_parts)
-		T += M.rating
-	efficiency_coeff = 2 ** (T - 1) //Only 1 manipulator here, you're making runtimes Razharas
-
 /obj/machinery/rnd/production/circuit_imprinter/disconnect_console()
 	linked_console.linked_imprinter = null
 	..()
\ No newline at end of file
diff --git a/code/modules/research/machinery/protolathe.dm b/code/modules/research/machinery/protolathe.dm
index 404a982b51..ef74fec666 100644
--- a/code/modules/research/machinery/protolathe.dm
+++ b/code/modules/research/machinery/protolathe.dm
@@ -20,13 +20,6 @@
 	production_animation = "protolathe_n"
 	allowed_buildtypes = PROTOLATHE
 
-/obj/machinery/rnd/production/protolathe/calculate_efficiency()
-	. = ..()
-	efficiency_coeff = 0
-	for(var/obj/item/stock_parts/manipulator/M in component_parts)
-		efficiency_coeff += M.rating
-	efficiency_coeff = max(1, efficiency_coeff)
-
 /obj/machinery/rnd/production/protolathe/disconnect_console()
 	linked_console.linked_lathe = null
 	..()
\ No newline at end of file