Merge pull request #12596 from Ghommie/Ghommie-cit819

Porting further material datum features and improvements.

code/modules/research/designs/machine_desings/machine_designs_all_misc.dm

@@ -154,3 +154,12 @@
 	build_path = /obj/item/circuitboard/machine/shuttle/heater
 	category = list ("Shuttle Machinery")
 	departmental_flags = DEPARTMENTAL_FLAG_ENGINEERING | DEPARTMENTAL_FLAG_SCIENCE
+
+/datum/design/board/sheetifier
+	name = "Sheetifier"
+	desc = "This machine turns weird things into sheets."
+	id = "sheetifier"
+	build_path = /obj/item/circuitboard/machine/sheetifier
+	category = list ("Misc. Machinery")
+	departmental_flags = DEPARTMENTAL_FLAG_ALL
+

code/modules/research/machinery/_production.dm

@@ -96,7 +96,7 @@
 	for(var/i in 1 to amount)
 		var/obj/O = new path(get_turf(src))
 		if(efficient_with(O.type))
-			O.set_custom_materials(matlist.Copy())
+			O.set_custom_materials(matlist)
 			O.rnd_crafted(src)
 	SSblackbox.record_feedback("nested tally", "item_printed", amount, list("[type]", "[path]"))
 	investigate_log("[key_name(user)] built [amount] of [path] at [src]([type]).", INVESTIGATE_RESEARCH)

code/modules/research/techweb/nodes/engineering_nodes.dm

@@ -16,7 +16,9 @@
 	display_name = "Advanced Engineering"
 	description = "Pushing the boundaries of physics, one chainsaw-fist at a time."
 	prereq_ids = list("engineering", "emp_basic")
-	design_ids = list("engine_goggles", "magboots", "forcefield_projector", "weldingmask" , "rcd_loaded", "rpd", "tray_goggles_prescription", "engine_goggles_prescription", "mesons_prescription", "rcd_upgrade_frames", "rcd_upgrade_simple_circuits", "rcd_ammo_large")
+	design_ids = list("engine_goggles", "magboots", "forcefield_projector", "weldingmask" , "rcd_loaded", "rpd",
+	"tray_goggles_prescription", "engine_goggles_prescription", "mesons_prescription", "rcd_upgrade_frames",
+	"rcd_upgrade_simple_circuits", "rcd_ammo_large", "sheetifier")
 	research_costs = list(TECHWEB_POINT_TYPE_GENERIC = 4000)
 
 /datum/techweb_node/anomaly