diff --git a/recipe.lua b/recipe.lua
index 6d0210a..bcce899 100644
--- a/recipe.lua
+++ b/recipe.lua
@@ -18,20 +18,20 @@ function prototype:getCost()
     return costs
 end
 
--- Returns table of item -> missing-count mappings. Empty table if recipe can be afforded
+-- Returns table of insufficient items. Empty table if recipe can be afforded
 function prototype:canAfford(chests)
     local storage = stackgroup.fromChests(table.unpack(chests))
     local costs = self:getCost()
 
     local missing = {}
     for item,cost in pairs(costs) do
-        local group = storage:findGroup(item)
-        if group == nil or group.total < cost then
+        local group = storage:findAllGroups({ item = item, total = function(checkTotal) return checkTotal >= cost end })
+        if #group == 0 then
             local totalMissing = cost
             if group ~= nil then
                 totalMissing = totalMissing - group.total
             end
-            missing[item] = totalMissing
+            table.insert(missing, item)
         end
     end
 
@@ -42,7 +42,7 @@ function prototype:beginCrafting(chests)
     local storage = stackgroup.fromChests(table.unpack(chests))
 
     for _,input in pairs(self.inputs) do
-        local group = storage:findGroup(input.item)
+        local group = storage:findAllGroups({ item = input.item, total = function(checkTotal) return checkTotal >= input.cost end })[1]
         group:moveItemsToPeripheral(chests, input.count, input.machine, input.slot)
     end
 
@@ -51,7 +51,7 @@ function prototype:beginCrafting(chests)
         for _,output in pairs(self.outputs) do
             local stackdata = itemstack.fromSlot(output.machine, output.slot)
 
-            if output.item ~= stackdata.item or output.count > stackdata.count then
+            if util.fuzzyEquals(stackdata.item, output.item) or output.count > stackdata.count then
                 return false
             end
         end
diff --git a/stackgroup.lua b/stackgroup.lua
index edea9ee..2edae92 100644
--- a/stackgroup.lua
+++ b/stackgroup.lua
@@ -93,6 +93,10 @@ function stackgroupSetPrototype:findGroup(item)
     return util.find(self, function(group) return group.item == item end)
 end
 
+function stackgroupSetPrototype:findAllGroups(groupPattern)
+    return util.findAll(self, function(group) return util.fuzzyEquals(group, groupPattern) end)
+end
+
 function stackgroup.fromChests(...)
     local chests = { ... }
     local groups = {}
diff --git a/util.lua b/util.lua
index 7074a45..064f194 100644
--- a/util.lua
+++ b/util.lua
@@ -34,9 +34,54 @@ function util.find(array, f)
     return nil
 end
 
+function util.findAll(array, f)
+    local matches = {}
+    for k,v in pairs(array) do
+        if f(v, k) then
+            table.insert(matches, v)
+        end
+    end
+    return matches
+end
+
 function util.isEmpty(tbl)
   local next, t = pairs(tbl)
   return next(t) == nil
 end
 
+function util.fuzzyEquals(value, pattern)
+    local valueType = type(value)
+    local patternType = type(pattern)
+
+    if patternType == "nil" then
+        return true
+    end
+
+    if patternType == "function" then
+        return pattern(value)
+    end
+
+    if valueType ~= patternType then
+        return false
+    end
+
+    if valueType == "table" then
+        for k,_ in pairs(pattern) do
+            if value[k] == nil then
+                return false
+            end
+        end
+
+        for k,v in pairs(value) do
+            if not util.compareValue(v, pattern[k]) then
+                return false
+            end
+        end
+
+        return true
+    end
+
+    return value == pattern
+end
+
 return util
\ No newline at end of file