Split printer settings into own category. If you changed printer related settings, you may have to set them again.

Increase cost for 3D prints a bit if they emit custom redstone signal strengths (i.e. something in [1, 14]).
Added settings for chamelium and ink value.
Moved some things around.

src/main/resources/application.conf

@@ -908,6 +908,46 @@ opencomputers {
       relayAmountUpgrade: 1
   }
 
+  # 3D printer related stuff.
+  printer {
+    # The maximum number of shape for a state of a 3D print allowed. This is
+    # for the individual states (off and on), so it is possible to have up to
+    # this many shapes *per state* (the reasoning being that only one state
+    # will ever be visible at a time).
+    maxShapes: 24
+
+    # How much of the material used to print a model is refunded when using
+    # the model to refuel a printer. This the value the original material
+    # cost is multiplied with, so 1 is a full refund, 0 disables the
+    # functionality (won't be able to put prints into the material input).
+    recycleRate: 0.75
+
+    # Whether Chamelium is edible or not. When eaten, it gives a (short)
+    # invisibility buff, and (slightly longer) blindness debuff.
+    chameliumEdible: true
+
+    # The maximum light level a printed block can emit. This defaults to
+    # a value similar to that of a redstone torch, because by default the
+    # material prints are made of contains redstone, but no glowstone.
+    # Prints' light level can further be boosted by crafting them with
+    # glowstone dust. This is merely the maximum light level that can be
+    # achieved directly when printing them.
+    maxBaseLightLevel: 8
+
+    # The extra material cost involved for printing a model with a customized
+    # redstone output, i.e. something in [1, 14].
+    customRedstoneCost: 300
+
+    # The amount by which a printers material buffer gets filled for a single
+    # chamelium. Tweak this if you think printing is too cheap or expensive.
+    materialValue: 2000
+
+    # The amount by which a printers ink buffer gets filled for a single
+    # cartridge. Tweak this if you think printing is too cheap or expensive.
+    # Note: the amount a single dye adds is this divided by 10.
+    inkValue: 50000
+  }
+
   # Other settings that you might find useful to tweak.
   misc {
       # The maximum width of multi-block screens, in blocks.
@@ -1029,30 +1069,6 @@ opencomputers {
       # avoid issues with computers timing out, but can also lead to higher
       # server load. AGAIN, USE WITH CARE!
       threadPriority: -1
-
-      # The maximum number of shape for a state of a 3D print allowed. This is
-      # for the individual states (off and on), so it is possible to have up to
-      # this many shapes *per state* (the reasoning being that only one state
-      # will ever be visible at a time).
-      maxPrinterShapes: 24
-
-      # How much of the material used to print a model is refunded when using
-      # the model to refuel a printer. This the value the original material
-      # cost is multiplied with, so 1 is a full refund, 0 disables the
-      # functionality (won't be able to put prints into the material input).
-      printRecycleRate: 0.75
-
-      # Whether Chamelium is edible or not. When eaten, it gives a (short)
-      # invisibility buff, and (slightly longer) blindness debuff.
-      chameliumEdible: true
-
-      # The maximum light level a printed block can emit. This defaults to
-      # a value similar to that of a redstone torch, because by default the
-      # material prints are made of contains redstone, but no glowstone.
-      # Prints' light level can further be boosted by crafting them with
-      # glowstone dust. This is merely the maximum light level that can be
-      # achieved directly when printing them.
-      maxPrintLightLevel: 8
   }
 
   # Settings for mod integration (the mod previously known as OpenComponents).

src/main/scala/li/cil/oc/Settings.scala

@@ -293,10 +293,16 @@ class Settings(val config: Config) {
   val presentChance = config.getDouble("misc.presentChance") max 0 min 1
   val assemblerBlacklist = config.getStringList("misc.assemblerBlacklist")
   val threadPriority = config.getInt("misc.threadPriority")
-  val maxPrintComplexity = config.getInt("misc.maxPrinterShapes")
+
-  val printRecycleRate = config.getDouble("misc.printRecycleRate")
+  // ----------------------------------------------------------------------- //
-  val chameliumEdible = config.getBoolean("misc.chameliumEdible")
+  // printer
-  val maxPrintLightLevel = config.getInt("misc.maxPrintLightLevel") max 0 min 15
+  val maxPrintComplexity = config.getInt("printer.maxShapes")
+  val printRecycleRate = config.getDouble("printer.recycleRate")
+  val chameliumEdible = config.getBoolean("printer.chameliumEdible")
+  val maxPrintLightLevel = config.getInt("printer.maxBaseLightLevel") max 0 min 15
+  val printCustomRedstone = config.getInt("printer.customRedstoneCost") max 0
+  val printMaterialValue = config.getInt("printer.materialValue") max 0
+  val printInkValue = config.getInt("printer.inkValue") max 0
 
   // ----------------------------------------------------------------------- //
   // integration

src/main/scala/li/cil/oc/common/item/Delegate.scala

@@ -70,6 +70,10 @@ trait Delegate {
 
   def color(stack: ItemStack, pass: Int) = 0xFFFFFF
 
+  def getContainerItem(stack: ItemStack): ItemStack = null
+
+  def hasContainerItem(stack: ItemStack): Boolean = false
+
   def displayName(stack: ItemStack): Option[String] = None
 
   @SideOnly(Side.CLIENT)

src/main/scala/li/cil/oc/common/item/Delegator.scala

@@ -94,6 +94,18 @@ class Delegator extends Item {
       case _ => super.getColorFromItemStack(stack, pass)
     }
 
+  override def getContainerItem(stack: ItemStack): ItemStack =
+    subItem(stack) match {
+      case Some(subItem) => subItem.getContainerItem(stack)
+      case _ => super.getContainerItem(stack)
+    }
+
+  override def hasContainerItem(stack: ItemStack): Boolean =
+    subItem(stack) match {
+      case Some(subItem) => subItem.hasContainerItem(stack)
+      case _ => super.hasContainerItem(stack)
+    }
+
   override def getChestGenBase(chest: ChestGenHooks, rnd: Random, original: WeightedRandomChestContent) = original
 
   override def doesSneakBypassUse(world: World, x: Int, y: Int, z: Int, player: EntityPlayer) = {

src/main/scala/li/cil/oc/common/item/InkCartridge.scala

@@ -1,5 +1,17 @@
 package li.cil.oc.common.item
 
+import li.cil.oc.api
+import net.minecraft.item.ItemStack
+
 class InkCartridge(val parent: Delegator) extends Delegate {
   override def maxStackSize = 1
+
+  override def getContainerItem(stack: ItemStack): ItemStack = {
+    if (api.Items.get(stack) == api.Items.get("inkCartridge"))
+      api.Items.get("inkCartridgeEmpty").createItemStack(1)
+    else
+      super.getContainerItem(stack)
+  }
+
+  override def hasContainerItem(stack: ItemStack): Boolean = true
 }

src/main/scala/li/cil/oc/common/item/data/PrintData.scala

@@ -1,6 +1,9 @@
 package li.cil.oc.common.item.data
 
+import li.cil.oc.Settings
 import li.cil.oc.api
+import li.cil.oc.util.Color
+import li.cil.oc.util.ExtendedAABB._
 import li.cil.oc.util.ExtendedNBT._
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
@@ -102,6 +105,46 @@ object PrintData {
     volume
   }
 
+  def computeCosts(data: PrintData) = {
+    val totalVolume = data.stateOn.foldLeft(0)((acc, shape) => acc + shape.bounds.volume) + data.stateOff.foldLeft(0)((acc, shape) => acc + shape.bounds.volume)
+    val totalSurface = data.stateOn.foldLeft(0)((acc, shape) => acc + shape.bounds.surface) + data.stateOff.foldLeft(0)((acc, shape) => acc + shape.bounds.surface)
+
+    if (totalVolume > 0) {
+      val baseMaterialRequired = (totalVolume / 2) max 1
+      val materialRequired =
+        if (data.redstoneLevel > 0 && data.redstoneLevel < 15) baseMaterialRequired + Settings.get.printCustomRedstone
+        else baseMaterialRequired
+      val inkRequired = (totalSurface / 6) max 1
+
+      Option((materialRequired, inkRequired))
+    }
+    else None
+  }
+
+  private val materialPerItem = Settings.get.printMaterialValue
+  private val inkPerCartridge = Settings.get.printInkValue
+
+  def materialValue(stack: ItemStack) = {
+    if (api.Items.get(stack) == api.Items.get("chamelium"))
+      materialPerItem
+    else if (api.Items.get(stack) == api.Items.get("print")) {
+      val data = new PrintData(stack)
+      computeCosts(data) match {
+        case Some((materialRequired, inkRequired)) => (materialRequired * Settings.get.printRecycleRate).toInt
+        case _ => 0
+      }
+    }
+    else 0
+  }
+
+  def inkValue(stack: ItemStack) = {
+    if (api.Items.get(stack) == api.Items.get("inkCartridge"))
+      inkPerCartridge
+    else if (Color.isDye(stack))
+      inkPerCartridge / 10
+    else 0
+  }
+
   def nbtToShape(nbt: NBTTagCompound): Shape = {
     val aabb =
       if (nbt.hasKey("minX")) {

src/main/scala/li/cil/oc/common/tileentity/Printer.scala

@@ -12,7 +12,6 @@ import li.cil.oc.api.machine.Context
 import li.cil.oc.api.network._
 import li.cil.oc.common.item.data.PrintData
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
-import li.cil.oc.util.ExtendedAABB._
 import li.cil.oc.util.ExtendedNBT._
 import li.cil.oc.util.ItemUtils
 import net.minecraft.inventory.ISidedInventory
@@ -39,9 +38,6 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
   var totalRequiredEnergy = 0.0
   var requiredEnergy = 0.0
 
-  val materialPerItem = 2000
-  val inkPerCartridge = 50000
-
   val slotMaterial = 0
   val slotInk = 1
   val slotOutput = 2
@@ -201,34 +197,6 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
 
   // ----------------------------------------------------------------------- //
 
-  def computeCosts(data: PrintData) = {
-    val totalVolume = data.stateOn.foldLeft(0)((acc, shape) => acc + shape.bounds.volume) + data.stateOff.foldLeft(0)((acc, shape) => acc + shape.bounds.volume)
-    val totalSurface = data.stateOn.foldLeft(0)((acc, shape) => acc + shape.bounds.surface) + data.stateOff.foldLeft(0)((acc, shape) => acc + shape.bounds.surface)
-
-    if (totalVolume > 0) {
-      val materialRequired = (totalVolume / 2) max 1
-      val inkRequired = (totalSurface / 6) max 1
-
-      Option((materialRequired, inkRequired))
-    }
-    else None
-  }
-
-  def materialValue(stack: ItemStack) = {
-    if (api.Items.get(stack) == api.Items.get("chamelium"))
-      materialPerItem
-    else if (api.Items.get(stack) == api.Items.get("print")) {
-      val data = new PrintData(stack)
-      computeCosts(data) match {
-        case Some((materialRequired, inkRequired)) => (materialRequired * Settings.get.printRecycleRate).toInt
-        case _ => 0
-      }
-    }
-    else 0
-  }
-
-  // ----------------------------------------------------------------------- //
-
   override def canUpdate = isServer
 
   override def updateEntity() {
@@ -241,7 +209,7 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
     }
 
     if (isActive && output.isEmpty && canMergeOutput) {
-      computeCosts(data) match {
+      PrintData.computeCosts(data) match {
         case Some((materialRequired, inkRequired)) =>
           totalRequiredEnergy = Settings.get.printCost
           requiredEnergy = totalRequiredEnergy
@@ -282,7 +250,7 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
       ServerPacketSender.sendPrinting(this, have > 0.5 && output.isDefined)
     }
 
-    val inputValue = materialValue(getStackInSlot(slotMaterial))
+    val inputValue = PrintData.materialValue(getStackInSlot(slotMaterial))
     if (inputValue > 0 && maxAmountMaterial - amountMaterial >= inputValue) {
       val material = decrStackSize(slotMaterial, 1)
       if (material != null) {
@@ -290,10 +258,14 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
       }
     }
 
-    if (maxAmountInk - amountInk >= inkPerCartridge) {
+    val inkValue = PrintData.inkValue(getStackInSlot(slotInk))
-      if (api.Items.get(getStackInSlot(slotInk)) == api.Items.get("inkCartridge")) {
+    if (inkValue > 0 && maxAmountInk - amountInk >= inkValue) {
-        setInventorySlotContents(slotInk, api.Items.get("inkCartridgeEmpty").createItemStack(1))
+      val material = decrStackSize(slotInk, 1)
-        amountInk += inkPerCartridge
+      if (material != null) {
+        amountInk += inkValue
+        if (material.getItem.hasContainerItem(material)) {
+          setInventorySlotContents(slotInk, material.getItem.getContainerItem(material))
+        }
       }
     }
   }
@@ -345,7 +317,7 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
 
   override def isItemValidForSlot(slot: Int, stack: ItemStack) =
     if (slot == slotMaterial)
-      materialValue(stack) > 0
+      PrintData.materialValue(stack) > 0
     else if (slot == slotInk)
       api.Items.get(stack) == api.Items.get("inkCartridge")
     else false