Solderer can probably use some speed upgradability too

src/main/java/refinedstorage/container/ContainerSolderer.java

@@ -3,7 +3,11 @@ package refinedstorage.container;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.inventory.Slot;
 import net.minecraft.item.ItemStack;
+import refinedstorage.RefinedStorageItems;
+import refinedstorage.container.slot.IItemValidator;
+import refinedstorage.container.slot.SlotFiltered;
 import refinedstorage.container.slot.SlotOutput;
+import refinedstorage.item.ItemUpgrade;
 import refinedstorage.tile.TileSolderer;
 
 public class ContainerSolderer extends ContainerBase {
@@ -21,6 +25,15 @@ public class ContainerSolderer extends ContainerBase {
 
         addSlotToContainer(new SlotOutput(solderer, 3, 134, 38));
 
+        for (int i = 0; i < 4; ++i) {
+            addSlotToContainer(new SlotFiltered(solderer.getUpgradesInventory(), i, 187, 6 + (i * 18), new IItemValidator() {
+                @Override
+                public boolean isValid(ItemStack stack) {
+                    return stack.getItem() == RefinedStorageItems.UPGRADE && stack.getMetadata() == ItemUpgrade.TYPE_SPEED;
+                }
+            }));
+        }
+
         addPlayerInventory(8, 95);
     }
 

src/main/java/refinedstorage/gui/GuiSolderer.java

@@ -8,7 +8,7 @@ public class GuiSolderer extends GuiBase {
     private TileSolderer solderer;
 
     public GuiSolderer(ContainerSolderer container, TileSolderer solderer) {
-        super(container, 176, 177);
+        super(container, 211, 177);
 
         this.solderer = solderer;
     }
@@ -29,7 +29,7 @@ public class GuiSolderer extends GuiBase {
         drawTexture(x, y, 0, 0, width, height);
 
         if (solderer.isWorking()) {
-            drawTexture(x + 83, y + 40 - 1, 177, 0, solderer.getProgressScaled(22), 15);
+            drawTexture(x + 83, y + 40 - 1, 212, 0, solderer.getProgressScaled(22), 15);
         }
     }
 

src/main/java/refinedstorage/tile/TileSolderer.java

@@ -27,6 +27,7 @@ public class TileSolderer extends TileMachine implements IInventory, ISidedInven
     };
 
     private InventorySimple inventory = new InventorySimple("solderer", 4, this);
+    private InventorySimple upgradesInventory = new InventorySimple("upgrades", 4, this);
 
     private ISoldererRecipe recipe;
 
@@ -56,9 +57,9 @@ public class TileSolderer extends TileMachine implements IInventory, ISidedInven
                 markDirty();
             }
         } else if (working) {
-            progress++;
+            progress += getSpeed();
 
-            if (progress == recipe.getDuration()) {
+            if (progress >= recipe.getDuration()) {
                 if (inventory.getStackInSlot(3) != null) {
                     inventory.getStackInSlot(3).stackSize += recipe.getResult().stackSize;
                 } else {
@@ -76,6 +77,18 @@ public class TileSolderer extends TileMachine implements IInventory, ISidedInven
         }
     }
 
+    public int getSpeed() {
+        int speed = 1;
+
+        for (int i = 0; i < upgradesInventory.getSizeInventory(); ++i) {
+            if (upgradesInventory.getStackInSlot(i) != null) {
+                speed += 1;
+            }
+        }
+
+        return speed;
+    }
+
     @Override
     public void onDisconnected() {
         super.onDisconnected();
@@ -96,6 +109,7 @@ public class TileSolderer extends TileMachine implements IInventory, ISidedInven
         super.readFromNBT(nbt);
 
         InventoryUtils.restoreInventory(this, 0, nbt);
+        InventoryUtils.restoreInventory(upgradesInventory, 1, nbt);
 
         recipe = SoldererRegistry.getRecipe(inventory);
 
@@ -113,6 +127,7 @@ public class TileSolderer extends TileMachine implements IInventory, ISidedInven
         super.writeToNBT(nbt);
 
         InventoryUtils.saveInventory(this, 0, nbt);
+        InventoryUtils.saveInventory(upgradesInventory, 1, nbt);
 
         nbt.setBoolean(NBT_WORKING, working);
         nbt.setInteger(NBT_PROGRESS, progress);
@@ -164,6 +179,9 @@ public class TileSolderer extends TileMachine implements IInventory, ISidedInven
     }
 
     public int getProgressScaled(int i) {
+        if (progress > duration) {
+            return i;
+        }
         return (int) ((float) progress / (float) duration * (float) i);
     }
 
@@ -271,4 +289,8 @@ public class TileSolderer extends TileMachine implements IInventory, ISidedInven
     public boolean canExtractItem(int slot, ItemStack stack, EnumFacing direction) {
         return slot == 3;
     }
+
+    public InventorySimple getUpgradesInventory() {
+        return upgradesInventory;
+    }
 }