diff --git a/biofuel-manager.lua b/biofuel-manager.lua
index de23200..0f3c5e3 100644
--- a/biofuel-manager.lua
+++ b/biofuel-manager.lua
@@ -73,13 +73,26 @@ local order = {
             }
             return biomass, sugar, cinder_flour
         end
-        local notEnoughMaterials = function ()
-            -- TODO
+        local enoughMaterials = function ()
             -- use ticker to test ( biomass >= 32, sugar >= 16, and cinder flour >= 16
+            local check = {}
+            check["createaddition:biomass"] = 32
+            check["minecraft:sugar"] = 16
+            check["create:cinder_flour"] = 16
+            for _, item in pairs(ticker.stock()) do
+                if check[item.name] then
+                    check[item.name] = check[item.name] - item.count
+                end
+            end
+            local enough_materials = true
+            for name, count in pairs(check) do
+                if count > 0 then enough_materials = false end
+            end
+            return enough_materials
         end
         local make_order = function (amt_to_make, amt_made)
             if amt_to_make <= 0 then return amt_made end
-            if notEnoughMaterials() then return amt_made end
+            if not enoughMaterials() then return amt_made end
             local count = ticker.requestFiltered(BIOFUEL_PKG, request())
             if count == 0 then return amt_made end
             amt_to_make = amt_to_make - count