diff --git a/code/game/objects/items.dm b/code/game/objects/items.dm
index 15d8af848c0..c10c04a9fa1 100644
--- a/code/game/objects/items.dm
+++ b/code/game/objects/items.dm
@@ -984,11 +984,10 @@
 /obj/item/proc/grind(datum/reagents/target_holder, mob/user)
 	if(on_grind() == -1)
 		return FALSE
-	if(!reagents)
-		reagents = new()
-	target_holder.add_reagent_list(grind_results)
-	if(reagents && target_holder)
-		reagents.trans_to(target_holder, reagents.total_volume, transferred_by = user)
+	if(target_holder)
+		target_holder.add_reagent_list(grind_results)
+		if(reagents)
+			reagents.trans_to(target_holder, reagents.total_volume, transferred_by = user)
 	return TRUE
 
 ///Called BEFORE the object is ground up - use this to change grind results based on conditions. Return "-1" to prevent the grinding from occurring
@@ -1001,9 +1000,10 @@
 /obj/item/proc/juice(datum/reagents/target_holder, mob/user)
 	if(on_juice() == -1)
 		return FALSE
-	reagents.convert_reagent(/datum/reagent/consumable, juice_typepath, include_source_subtypes = TRUE)
-	if(reagents && target_holder)
-		reagents.trans_to(target_holder, reagents.total_volume, transferred_by = user)
+	if(reagents)
+		reagents.convert_reagent(/datum/reagent/consumable, juice_typepath, include_source_subtypes = TRUE)
+		if(target_holder)
+			reagents.trans_to(target_holder, reagents.total_volume, transferred_by = user)
 	return TRUE
 
 /obj/item/proc/set_force_string()
diff --git a/code/game/objects/items/stacks/stack.dm b/code/game/objects/items/stacks/stack.dm
index 5c616fa4803..7050309268c 100644
--- a/code/game/objects/items/stacks/stack.dm
+++ b/code/game/objects/items/stacks/stack.dm
@@ -145,18 +145,49 @@
 /obj/item/stack/set_custom_materials(list/materials, multiplier=1, is_update=FALSE)
 	return is_update ? ..() : set_mats_per_unit(materials, multiplier/(amount || 1))
 
-
-/obj/item/stack/on_grind()
-	. = ..()
-	for(var/i in 1 to length(grind_results)) //This should only call if it's ground, so no need to check if grind_results exists
-		grind_results[grind_results[i]] *= get_amount() //Gets the key at position i, then the reagent amount of that key, then multiplies it by stack size
-
 /obj/item/stack/grind_requirements()
 	if(is_cyborg)
 		to_chat(usr, span_warning("[src] is too integrated into your chassis and can't be ground up!"))
 		return
 	return TRUE
 
+/obj/item/stack/grind(datum/reagents/target_holder, mob/user)
+	var/current_amount = get_amount()
+	if(current_amount <= 0 || QDELETED(src)) //just to get rid of this 0 amount/deleted stack we return success
+		return TRUE
+	if(on_grind() == -1)
+		return FALSE
+	if(isnull(target_holder))
+		return TRUE
+
+	if(reagents)
+		reagents.trans_to(target_holder, reagents.total_volume, transferred_by = user)
+	var/available_volume = target_holder.maximum_volume - target_holder.total_volume
+
+	//compute total volume of reagents that will be occupied by grind_results
+	var/total_volume = 0
+	for(var/reagent in grind_results)
+		total_volume += grind_results[reagent]
+
+	//compute number of pieces(or sheets) from available_volume
+	var/available_amount = min(current_amount, round(available_volume / total_volume))
+	if(available_amount <= 0)
+		return FALSE
+
+	//Now transfer the grind results scaled by available_amount
+	var/list/grind_reagents = grind_results.Copy()
+	for(var/reagent in grind_reagents)
+		grind_reagents[reagent] *= available_amount
+	target_holder.add_reagent_list(grind_reagents)
+
+	/**
+	 * use available_amount of sheets/pieces, return TRUE only if all sheets/pieces of this stack were used
+	 * we don't delete this stack when it reaches 0 because we expect the all in one grinder, etc to delete
+	 * this stack if grinding was successfull
+	 */
+	use(available_amount, check = FALSE)
+	return available_amount == current_amount
+
 /obj/item/stack/proc/get_main_recipes()
 	RETURN_TYPE(/list)
 	SHOULD_CALL_PARENT(TRUE)
diff --git a/code/modules/plumbing/plumbers/grinder_chemical.dm b/code/modules/plumbing/plumbers/grinder_chemical.dm
index 5e3c3b0f5d3..e70977bc1f4 100644
--- a/code/modules/plumbing/plumbers/grinder_chemical.dm
+++ b/code/modules/plumbing/plumbers/grinder_chemical.dm
@@ -1,6 +1,6 @@
 /obj/machinery/plumbing/grinder_chemical
 	name = "chemical grinder"
-	desc = "chemical grinder."
+	desc = "Chemical grinder. Can either grind or juice stuff you put in."
 	icon_state = "grinder_chemical"
 	layer = ABOVE_ALL_MOB_LAYER
 	plane = ABOVE_GAME_PLANE
@@ -8,7 +8,6 @@
 	reagent_flags = TRANSPARENT | DRAINABLE
 	buffer = 400
 	active_power_usage = BASE_MACHINE_ACTIVE_CONSUMPTION * 2
-	var/eat_dir = SOUTH
 
 /obj/machinery/plumbing/grinder_chemical/Initialize(mapload, bolt, layer)
 	. = ..()
@@ -18,21 +17,35 @@
 	)
 	AddElement(/datum/element/connect_loc, loc_connections)
 
-/obj/machinery/plumbing/grinder_chemical/setDir(newdir)
-	. = ..()
-	eat_dir = newdir
+/obj/machinery/plumbing/grinder_chemical/attackby(obj/item/weapon, mob/user, params)
+	if(istype(weapon, /obj/item/storage/bag))
+		to_chat(user, span_notice("You dump items from [weapon] into the grinder."))
+		for(var/obj/item/obj_item in weapon.contents)
+			grind(obj_item)
+	else
+		to_chat(user, span_notice("You attempt to grind [weapon]."))
+		grind(weapon)
+
+	return TRUE
 
 /obj/machinery/plumbing/grinder_chemical/CanAllowThrough(atom/movable/mover, border_dir)
 	. = ..()
 	if(!anchored)
 		return
-	if(border_dir == eat_dir)
-		return TRUE
+	if(!istype(mover, /obj/item))
+		return FALSE
+	return TRUE
 
 /obj/machinery/plumbing/grinder_chemical/proc/on_entered(datum/source, atom/movable/AM)
 	SIGNAL_HANDLER
+
 	grind(AM)
 
+/**
+ * Grinds/Juices the atom
+ * Arguments
+ * * [AM][atom] - the atom to grind or juice
+ */
 /obj/machinery/plumbing/grinder_chemical/proc/grind(atom/AM)
 	if(machine_stat & NOPOWER)
 		return
@@ -40,11 +53,14 @@
 		return
 	if(!isitem(AM))
 		return
+
 	var/obj/item/I = AM
+	var/result
 	if(I.grind_results || I.juice_typepath)
 		use_power(active_power_usage)
 		if(I.grind_results)
-			I.grind(src, src)
+			result = I.grind(reagents, usr)
 		else if (I.juice_typepath)
-			I.juice(src, src)
-		qdel(I)
+			result = I.juice(reagents, usr)
+		if(result)
+			qdel(I)
diff --git a/code/modules/reagents/chemistry/holder.dm b/code/modules/reagents/chemistry/holder.dm
index 4e5930b96df..902ccf35e6a 100644
--- a/code/modules/reagents/chemistry/holder.dm
+++ b/code/modules/reagents/chemistry/holder.dm
@@ -1391,9 +1391,7 @@
 
 /// Is this holder full or not
 /datum/reagents/proc/holder_full()
-	if(total_volume >= maximum_volume)
-		return TRUE
-	return FALSE
+	return total_volume >= maximum_volume
 
 /// Get the amount of this reagent
 /datum/reagents/proc/get_reagent_amount(reagent, include_subtypes = FALSE)
diff --git a/code/modules/reagents/chemistry/machinery/reagentgrinder.dm b/code/modules/reagents/chemistry/machinery/reagentgrinder.dm
index 35be2dc1865..26ebfa1d18d 100644
--- a/code/modules/reagents/chemistry/machinery/reagentgrinder.dm
+++ b/code/modules/reagents/chemistry/machinery/reagentgrinder.dm
@@ -99,11 +99,9 @@
 	. = ..()
 	if(. == SECONDARY_ATTACK_CANCEL_ATTACK_CHAIN)
 		return
-	if(!can_interact(user) || !user.can_perform_action(src, ALLOW_SILICON_REACH|FORBID_TELEKINESIS_REACH))
+	if(operating || !user.can_perform_action(src, ALLOW_SILICON_REACH | FORBID_TELEKINESIS_REACH))
 		return
-	if(operating)
-		return
-	replace_beaker(user)
+	eject(user)
 	return SECONDARY_ATTACK_CANCEL_ATTACK_CHAIN
 
 /obj/machinery/reagentgrinder/attack_robot_secondary(mob/user, list/modifiers)
@@ -146,24 +144,28 @@
 	default_unfasten_wrench(user, tool)
 	return TOOL_ACT_TOOLTYPE_SUCCESS
 
-/obj/machinery/reagentgrinder/attackby(obj/item/I, mob/living/user, params)
-	//You can only screw open empty grinder
-	if(!beaker && !length(holdingitems) && default_deconstruction_screwdriver(user, icon_state, icon_state, I))
-		return
+/obj/machinery/reagentgrinder/screwdriver_act(mob/living/user, obj/item/tool)
+	. = TOOL_ACT_TOOLTYPE_SUCCESS
+	if(!beaker && !length(holdingitems))
+		return default_deconstruction_screwdriver(user, icon_state, icon_state, tool)
 
-	if(default_deconstruction_crowbar(I))
-		return
+/obj/machinery/reagentgrinder/crowbar_act(mob/living/user, obj/item/tool)
+	return default_deconstruction_crowbar(tool)
 
+/obj/machinery/reagentgrinder/attackby(obj/item/weapon, mob/living/user, params)
 	if(panel_open) //Can't insert objects when its screwed open
 		return TRUE
 
-	if (is_reagent_container(I) && !(I.item_flags & ABSTRACT) && I.is_open_container())
-		var/obj/item/reagent_containers/B = I
+	if(!weapon.grind_requirements(src)) //Error messages should be in the objects' definitions
+		return
+
+	if (is_reagent_container(weapon) && !(weapon.item_flags & ABSTRACT) && weapon.is_open_container())
+		var/obj/item/reagent_containers/container = weapon
 		. = TRUE //no afterattack
-		if(!user.transferItemToLoc(B, src))
+		if(!user.transferItemToLoc(container, src))
 			return
-		replace_beaker(user, B)
-		to_chat(user, span_notice("You add [B] to [src]."))
+		replace_beaker(user, container)
+		to_chat(user, span_notice("You add [container] to [src]."))
 		update_appearance()
 		return TRUE //no afterattack
 
@@ -172,39 +174,36 @@
 		return TRUE
 
 	//Fill machine with a bag!
-	if(istype(I, /obj/item/storage/bag))
-		if(!I.contents.len)
-			to_chat(user, span_notice("[I] is empty!"))
+	if(istype(weapon, /obj/item/storage/bag))
+		if(!weapon.contents.len)
+			to_chat(user, span_notice("[weapon] is empty!"))
 			return TRUE
 
 		var/list/inserted = list()
-		if(I.atom_storage.remove_type(/obj/item/food/grown, src, limit - length(holdingitems), TRUE, FALSE, user, inserted))
+		if(weapon.atom_storage.remove_type(/obj/item/food/grown, src, limit - length(holdingitems), TRUE, FALSE, user, inserted))
 			for(var/i in inserted)
 				holdingitems[i] = TRUE
 			inserted = list()
-		if(I.atom_storage.remove_type(/obj/item/food/honeycomb, src, limit - length(holdingitems), TRUE, FALSE, user, inserted))
+		if(weapon.atom_storage.remove_type(/obj/item/food/honeycomb, src, limit - length(holdingitems), TRUE, FALSE, user, inserted))
 			for(var/i in inserted)
 				holdingitems[i] = TRUE
 
-		if(!I.contents.len)
-			to_chat(user, span_notice("You empty [I] into [src]."))
+		if(!weapon.contents.len)
+			to_chat(user, span_notice("You empty [weapon] into [src]."))
 		else
 			to_chat(user, span_notice("You fill [src] to the brim."))
 		return TRUE
 
-	if(!I.grind_results && !I.juice_typepath)
+	if(!weapon.grind_results && !weapon.juice_typepath)
 		if(user.combat_mode)
 			return ..()
 		else
-			to_chat(user, span_warning("You cannot grind [I] into reagents!"))
+			to_chat(user, span_warning("You cannot grind/juice [weapon] into reagents!"))
 			return TRUE
 
-	if(!I.grind_requirements(src)) //Error messages should be in the objects' definitions
-		return
-
-	if(user.transferItemToLoc(I, src))
-		to_chat(user, span_notice("You add [I] to [src]."))
-		holdingitems[I] = TRUE
+	if(user.transferItemToLoc(weapon, src))
+		to_chat(user, span_notice("You add [weapon] to [src]."))
+		holdingitems[weapon] = TRUE
 		return FALSE
 
 /obj/machinery/reagentgrinder/ui_interact(mob/user) // The microwave Menu //I am reasonably certain that this is not a microwave
@@ -261,9 +260,9 @@
 	if(beaker)
 		replace_beaker(user)
 
-/obj/machinery/reagentgrinder/proc/remove_object(obj/item/O)
-	holdingitems -= O
-	qdel(O)
+/obj/machinery/reagentgrinder/proc/remove_object(obj/item/weapon)
+	holdingitems -= weapon
+	qdel(weapon)
 
 /obj/machinery/reagentgrinder/proc/start_shaking()
 	var/static/list/transforms
@@ -306,11 +305,11 @@
 
 /obj/machinery/reagentgrinder/proc/juice(mob/user)
 	power_change()
-	if(!beaker || machine_stat & (NOPOWER|BROKEN) || beaker.reagents.total_volume >= beaker.reagents.maximum_volume)
+	if(!beaker || machine_stat & (NOPOWER|BROKEN) || beaker.reagents.holder_full())
 		return
 	operate_for(50, juicing = TRUE)
 	for(var/obj/item/i in holdingitems)
-		if(beaker.reagents.total_volume >= beaker.reagents.maximum_volume)
+		if(beaker.reagents.holder_full())
 			break
 		var/obj/item/I = i
 		if(I.juice_typepath)
@@ -324,12 +323,12 @@
 
 /obj/machinery/reagentgrinder/proc/grind(mob/user)
 	power_change()
-	if(!beaker || machine_stat & (NOPOWER|BROKEN) || beaker.reagents.total_volume >= beaker.reagents.maximum_volume)
+	if(!beaker || machine_stat & (NOPOWER|BROKEN) || beaker.reagents.holder_full())
 		return
 	operate_for(60)
 	warn_of_dust() // don't breathe this.
 	for(var/i in holdingitems)
-		if(beaker.reagents.total_volume >= beaker.reagents.maximum_volume)
+		if(beaker.reagents.holder_full())
 			break
 		var/obj/item/I = i
 		if(I.grind_results)
@@ -337,7 +336,10 @@
 
 /obj/machinery/reagentgrinder/proc/grind_item(obj/item/I, mob/user) //Grind results can be found in respective object definitions
 	if(!I.grind(beaker.reagents, user))
-		to_chat(usr, span_danger("[src] shorts out as it tries to grind up [I], and transfers it back to storage."))
+		if(isstack(I))
+			to_chat(usr, span_notice("[src] attempts to grind as many pieces of [I] as possible."))
+		else
+			to_chat(usr, span_danger("[src] shorts out as it tries to grind up [I], and transfers it back to storage."))
 		return
 	remove_object(I)
 
@@ -347,7 +349,7 @@
 	if(!beaker || machine_stat & (NOPOWER|BROKEN))
 		return
 	operate_for(50, juicing = TRUE)
-	addtimer(CALLBACK(src, TYPE_PROC_REF(/obj/machinery/reagentgrinder, mix_complete)), 50)
+	addtimer(CALLBACK(src, PROC_REF(mix_complete)), 50 / speed)
 
 /obj/machinery/reagentgrinder/proc/mix_complete()
 	if(beaker?.reagents.total_volume <= 0)
diff --git a/code/modules/reagents/reagent_containers/cups/_cup.dm b/code/modules/reagents/reagent_containers/cups/_cup.dm
index 069c770f009..b5930955a31 100644
--- a/code/modules/reagents/reagent_containers/cups/_cup.dm
+++ b/code/modules/reagents/reagent_containers/cups/_cup.dm
@@ -537,7 +537,10 @@
 
 /obj/item/reagent_containers/cup/mortar/proc/grind_item(obj/item/item, mob/living/carbon/human/user)
 	if(!item.grind(reagents, user))
-		to_chat(user, span_notice("You fail to grind [item]."))
+		if(isstack(item))
+			to_chat(usr, span_notice("[src] attempts to grind as many pieces of [item] as possible."))
+		else
+			to_chat(user, span_danger("You fail to grind [item]."))
 		return
 	to_chat(user, span_notice("You grind [item] into a nice powder."))
 	grinded = null