reworked so its just part 1

code/modules/reagents/chemistry/machinery/chem_dispenser.dm

@@ -16,7 +16,6 @@
 	var/recharge_counter = 0
 	var/hackedcheck = FALSE
 	var/obj/item/reagent_containers/beaker = null
-	var/image/icon_beaker = null //cached overlay
 	var/list/dispensable_reagents = list("hydrogen", "lithium", "carbon", "nitrogen", "oxygen", "fluorine",
 	"sodium", "aluminum", "silicon", "phosphorus", "sulfur", "chlorine", "potassium", "iron",
 	"copper", "mercury", "plasma", "radium", "water", "ethanol", "sugar", "iodine", "bromine", "silver", "chromium")
@@ -127,8 +126,10 @@
 /obj/machinery/chem_dispenser/power_change()
 	if(powered())
 		stat &= ~NOPOWER
+		icon_state = "dispenser"
 	else
 		stat |= NOPOWER
+		icon_state = "[icon_state]_nopower"
 
 /obj/machinery/chem_dispenser/ex_act(severity)
 	if(severity < 3)
@@ -140,7 +141,6 @@
 	..()
 	if(A == beaker)
 		beaker = null
-		overlays.Cut()
 
 /obj/machinery/chem_dispenser/ui_interact(mob/user, ui_key = "main", datum/tgui/ui = null, force_open = FALSE, datum/tgui/master_ui = null, datum/ui_state/state = GLOB.default_state)
 	// update the ui if it exists, returns null if no ui is passed/found
@@ -204,11 +204,6 @@
 				atom_say("Not enough energy to complete operation!")
 				return
 			R.add_reagent(params["reagent"], actual)
-			overlays.Cut()
-			if(!icon_beaker)
-				icon_beaker = mutable_appearance('icons/obj/chemical.dmi', "disp_beaker") //randomize beaker overlay position.
-			icon_beaker.pixel_x = rand(-10, 5)
-			overlays += icon_beaker
 		if("remove")
 			var/amount = text2num(params["amount"])
 			if(!beaker || !amount)
@@ -226,7 +221,6 @@
 			if(Adjacent(usr) && !issilicon(usr))
 				usr.put_in_hands(beaker)
 			beaker = null
-			overlays.Cut()
 		else
 			return FALSE
 
@@ -255,10 +249,6 @@
 		I.forceMove(src)
 		to_chat(user, "<span class='notice'>You set [I] on the machine.</span>")
 		SStgui.update_uis(src) // update all UIs attached to src
-		if(!icon_beaker)
-			icon_beaker = mutable_appearance('icons/obj/chemical.dmi', "disp_beaker") //randomize beaker overlay position.
-		icon_beaker.pixel_x = rand(-10, 5)
-		overlays += icon_beaker
 		return
 	return ..()