diff --git a/src/main/resources/application.conf b/src/main/resources/application.conf
index be996ee43..f68159751 100644
--- a/src/main/resources/application.conf
+++ b/src/main/resources/application.conf
@@ -729,6 +729,11 @@ opencomputers {
           # Energy it costs to re-program an EEPROM. This is deliberately
           # expensive, to discourage frequent re-writing of EEPROMs.
           eepromWrite: 50
+
+          # How much energy is required per shape in a 3D print. With the
+          # default of 200 for example, it will take 1600 energy to print a
+          # block with 8 shapes in it.
+          printerShape: 200
       }
 
       # The rate at which different blocks accept external power. All of these
@@ -1011,6 +1016,12 @@ opencomputers {
       # format 'itemid@damage', were the damage is optional.
       # Examples: 'OpenComputers:case3', 'minecraft:stonebrick@1'
       assemblerBlacklist: []
+
+      # The maximum number of shape for a single 3D print allowed. This is for
+      # the sum of shapes in both states (off and on), so e.g. with the default
+      # of 32 you can use 10 shapes for the off state and 22 for the on state
+      # at maximum.
+      maxPrinterShapes: 32
   }
 
   # Settings for mod integration (the mod previously known as OpenComponents).
diff --git a/src/main/resources/assets/opencomputers/textures/gui/printer.png b/src/main/resources/assets/opencomputers/textures/gui/printer.png
new file mode 100644
index 000000000..f7e756e23
Binary files /dev/null and b/src/main/resources/assets/opencomputers/textures/gui/printer.png differ
diff --git a/src/main/resources/assets/opencomputers/textures/gui/printer_progress.png b/src/main/resources/assets/opencomputers/textures/gui/printer_progress.png
new file mode 100644
index 000000000..a4df8cc55
Binary files /dev/null and b/src/main/resources/assets/opencomputers/textures/gui/printer_progress.png differ
diff --git a/src/main/scala/li/cil/oc/Settings.scala b/src/main/scala/li/cil/oc/Settings.scala
index e899e34a7..73a96a9f7 100644
--- a/src/main/scala/li/cil/oc/Settings.scala
+++ b/src/main/scala/li/cil/oc/Settings.scala
@@ -192,6 +192,7 @@ class Settings(val config: Config) {
   val chunkloaderCost = config.getDouble("power.cost.chunkloaderCost") max 0
   val pistonCost = config.getDouble("power.cost.pistonPush") max 0
   val eepromWriteCost = config.getDouble("power.cost.eepromWrite") max 0
+  val printShapeCost = config.getDouble("power.cost.printerShape") max 0
 
   // power.rate
   val accessPointRate = config.getDouble("power.rate.accessPoint") max 0
@@ -290,6 +291,7 @@ class Settings(val config: Config) {
   val databaseEntriesPerTier = Array(9, 25, 81) // Not configurable because of GUI design.
   val presentChance = config.getDouble("misc.presentChance") max 0 min 1
   val assemblerBlacklist = config.getStringList("misc.assemblerBlacklist")
+  val maxPrintComplexity = config.getInt("misc.maxPrinterShapes")
 
   // ----------------------------------------------------------------------- //
   // integration
diff --git a/src/main/scala/li/cil/oc/client/GuiHandler.scala b/src/main/scala/li/cil/oc/client/GuiHandler.scala
index 6f1a078cf..944921e12 100644
--- a/src/main/scala/li/cil/oc/client/GuiHandler.scala
+++ b/src/main/scala/li/cil/oc/client/GuiHandler.scala
@@ -32,6 +32,8 @@ object GuiHandler extends CommonGuiHandler {
             new gui.Disassembler(player.inventory, t)
           case t: tileentity.DiskDrive if id == GuiType.DiskDrive.id =>
             new gui.DiskDrive(player.inventory, t)
+          case t: tileentity.Printer if id == GuiType.Printer.id =>
+            new gui.Printer(player.inventory, t)
           case t: tileentity.Raid if id == GuiType.Raid.id =>
             new gui.Raid(player.inventory, t)
           case t: tileentity.RobotProxy if id == GuiType.Robot.id =>
diff --git a/src/main/scala/li/cil/oc/client/Textures.scala b/src/main/scala/li/cil/oc/client/Textures.scala
index 324cab790..4d02efe8f 100644
--- a/src/main/scala/li/cil/oc/client/Textures.scala
+++ b/src/main/scala/li/cil/oc/client/Textures.scala
@@ -25,6 +25,8 @@ object Textures {
   val guiDisassembler = new ResourceLocation(Settings.resourceDomain, "textures/gui/disassembler.png")
   val guiDrone = new ResourceLocation(Settings.resourceDomain, "textures/gui/drone.png")
   val guiKeyboardMissing = new ResourceLocation(Settings.resourceDomain, "textures/gui/keyboard_missing.png")
+  val guiPrinter = new ResourceLocation(Settings.resourceDomain, "textures/gui/printer.png")
+  val guiPrinterProgress = new ResourceLocation(Settings.resourceDomain, "textures/gui/printer_progress.png")
   val guiRaid = new ResourceLocation(Settings.resourceDomain, "textures/gui/raid.png")
   val guiRange = new ResourceLocation(Settings.resourceDomain, "textures/gui/range.png")
   val guiRobot = new ResourceLocation(Settings.resourceDomain, "textures/gui/robot.png")
diff --git a/src/main/scala/li/cil/oc/client/gui/Printer.scala b/src/main/scala/li/cil/oc/client/gui/Printer.scala
new file mode 100644
index 000000000..3ad735a26
--- /dev/null
+++ b/src/main/scala/li/cil/oc/client/gui/Printer.scala
@@ -0,0 +1,66 @@
+package li.cil.oc.client.gui
+
+import li.cil.oc.Localization
+import li.cil.oc.client.Textures
+import li.cil.oc.client.gui.widget.ProgressBar
+import li.cil.oc.client.{PacketSender => ClientPacketSender}
+import li.cil.oc.common.container
+import li.cil.oc.common.container.ComponentSlot
+import li.cil.oc.common.tileentity
+import net.minecraft.entity.player.InventoryPlayer
+import net.minecraft.util.ResourceLocation
+import org.lwjgl.opengl.GL11
+
+class Printer(playerInventory: InventoryPlayer, val printer: tileentity.Printer) extends DynamicGuiContainer(new container.Printer(playerInventory, printer)) {
+  xSize = 176
+  ySize = 166
+
+  private val progress = addWidget(new ProgressBar(104, 21) {
+    override def width = 46
+
+    override def height = 46
+
+    override def barTexture = Textures.guiPrinterProgress
+  })
+
+  private def assemblerContainer = inventorySlots.asInstanceOf[container.Printer]
+
+  override def initGui() {
+    super.initGui()
+  }
+
+  override def drawSecondaryForegroundLayer(mouseX: Int, mouseY: Int) = {
+    super.drawSecondaryForegroundLayer(mouseX, mouseY)
+    fontRendererObj.drawString(
+      Localization.localizeImmediately(printer.getInventoryName),
+      8, 6, 0x404040)
+    GL11.glPushAttrib(GL11.GL_ALL_ATTRIB_BITS) // Me lazy... prevents NEI render glitch.
+    if (assemblerContainer.isAssembling && func_146978_c(progress.x, progress.y, progress.width, progress.height, mouseX, mouseY)) {
+      val tooltip = new java.util.ArrayList[String]
+      val timeRemaining = formatTime(assemblerContainer.assemblyRemainingTime)
+      tooltip.add(Localization.Assembler.Progress(assemblerContainer.assemblyProgress, timeRemaining))
+      copiedDrawHoveringText(tooltip, mouseX - guiLeft, mouseY - guiTop, fontRendererObj)
+    }
+    GL11.glPopAttrib()
+  }
+
+  private def formatTime(seconds: Int) = {
+    // Assembly times should not / rarely exceed one hour, so this is good enough.
+    if (seconds < 60) f"0:$seconds%02d"
+    else f"${seconds / 60}:${seconds % 60}%02d"
+  }
+
+  override def drawGuiContainerBackgroundLayer(dt: Float, mouseX: Int, mouseY: Int) {
+    GL11.glColor3f(1, 1, 1) // Required under Linux.
+    mc.renderEngine.bindTexture(Textures.guiPrinter)
+    drawTexturedModalRect(guiLeft, guiTop, 0, 0, xSize, ySize)
+    if (assemblerContainer.isAssembling) progress.level = assemblerContainer.assemblyProgress / 100.0
+    else progress.level = 0
+    drawWidgets()
+    drawInventorySlots()
+  }
+
+  override protected def drawDisabledSlot(slot: ComponentSlot) {}
+
+  override def doesGuiPauseGame = false
+}
\ No newline at end of file
diff --git a/src/main/scala/li/cil/oc/client/gui/widget/ProgressBar.scala b/src/main/scala/li/cil/oc/client/gui/widget/ProgressBar.scala
index 7f9beb31e..22541fbe5 100644
--- a/src/main/scala/li/cil/oc/client/gui/widget/ProgressBar.scala
+++ b/src/main/scala/li/cil/oc/client/gui/widget/ProgressBar.scala
@@ -9,6 +9,8 @@ class ProgressBar(val x: Int, val y: Int) extends Widget {
 
   override def height = 12
 
+  def barTexture = Textures.guiBar
+
   var level = 0.0
 
   def draw() {
@@ -21,7 +23,7 @@ class ProgressBar(val x: Int, val y: Int) extends Widget {
       val ty = owner.windowY + y
       val w = width * level
 
-      Minecraft.getMinecraft.renderEngine.bindTexture(Textures.guiBar)
+      Minecraft.getMinecraft.renderEngine.bindTexture(barTexture)
       val t = Tessellator.instance
       t.startDrawingQuads()
       t.addVertexWithUV(tx, ty, owner.windowZ, u0, v0)
diff --git a/src/main/scala/li/cil/oc/client/gui/widget/Widget.scala b/src/main/scala/li/cil/oc/client/gui/widget/Widget.scala
index c97facd41..db1552137 100644
--- a/src/main/scala/li/cil/oc/client/gui/widget/Widget.scala
+++ b/src/main/scala/li/cil/oc/client/gui/widget/Widget.scala
@@ -11,5 +11,5 @@ abstract class Widget {
 
   def height: Int
 
-  def draw()
+  def draw(): Unit
 }
diff --git a/src/main/scala/li/cil/oc/common/GuiHandler.scala b/src/main/scala/li/cil/oc/common/GuiHandler.scala
index 366963ebc..b6a42bfee 100644
--- a/src/main/scala/li/cil/oc/common/GuiHandler.scala
+++ b/src/main/scala/li/cil/oc/common/GuiHandler.scala
@@ -24,6 +24,8 @@ abstract class GuiHandler extends IGuiHandler {
             new container.Disassembler(player.inventory, t)
           case t: tileentity.DiskDrive if id == GuiType.DiskDrive.id =>
             new container.DiskDrive(player.inventory, t)
+          case t: tileentity.Printer if id == GuiType.Printer.id =>
+            new container.Printer(player.inventory, t)
           case t: tileentity.Raid if id == GuiType.Raid.id =>
             new container.Raid(player.inventory, t)
           case t: tileentity.RobotProxy if id == GuiType.Robot.id =>
diff --git a/src/main/scala/li/cil/oc/common/GuiType.scala b/src/main/scala/li/cil/oc/common/GuiType.scala
index 7628f8178..17927f40b 100644
--- a/src/main/scala/li/cil/oc/common/GuiType.scala
+++ b/src/main/scala/li/cil/oc/common/GuiType.scala
@@ -21,6 +21,7 @@ object GuiType extends ScalaEnum {
   val Disassembler = new EnumVal { def name = "Disassembler"; def subType = GuiType.Category.Block }
   val DiskDrive = new EnumVal { def name = "DiskDrive"; def subType = GuiType.Category.Block }
   val Drone = new EnumVal { def name = "Drone"; def subType = GuiType.Category.Entity }
+  val Printer = new EnumVal { def name = "Printer"; def subType = GuiType.Category.Block }
   val Rack = new EnumVal { def name = "Rack"; def subType = GuiType.Category.Block }
   val Raid = new EnumVal { def name = "Raid"; def subType = GuiType.Category.Block }
   val Robot = new EnumVal { def name = "Robot"; def subType = GuiType.Category.Block }
diff --git a/src/main/scala/li/cil/oc/common/block/Print.scala b/src/main/scala/li/cil/oc/common/block/Print.scala
index ffde03aa7..f28a8540f 100644
--- a/src/main/scala/li/cil/oc/common/block/Print.scala
+++ b/src/main/scala/li/cil/oc/common/block/Print.scala
@@ -2,6 +2,7 @@ package li.cil.oc.common.block
 
 import li.cil.oc.Settings
 import li.cil.oc.common.tileentity
+import li.cil.oc.util.ExtendedAABB
 import net.minecraft.entity.EntityLivingBase
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.item.ItemStack
@@ -38,6 +39,10 @@ class Print(protected implicit val tileTag: ClassTag[tileentity.Print]) extends
     }
   }
 
+  override def setBlockBoundsForItemRender(metadata: Int): Unit = {
+    setBlockBounds(ExtendedAABB.unitBounds)
+  }
+
   // ----------------------------------------------------------------------- //
 
   override def hasTileEntity(metadata: Int) = true
diff --git a/src/main/scala/li/cil/oc/common/block/Printer.scala b/src/main/scala/li/cil/oc/common/block/Printer.scala
new file mode 100644
index 000000000..d0be27b26
--- /dev/null
+++ b/src/main/scala/li/cil/oc/common/block/Printer.scala
@@ -0,0 +1,42 @@
+package li.cil.oc.common.block
+
+import li.cil.oc.Settings
+import li.cil.oc.client.Textures
+import li.cil.oc.common.GuiType
+import li.cil.oc.common.tileentity
+import net.minecraft.client.renderer.texture.IIconRegister
+import net.minecraft.world.IBlockAccess
+import net.minecraft.world.World
+import net.minecraftforge.common.util.ForgeDirection
+
+class Printer extends SimpleBlock with traits.SpecialBlock with traits.PowerAcceptor with traits.StateAware with traits.GUI {
+  override protected def customTextures = Array(
+    None,
+    Some("AssemblerTop"),
+    Some("AssemblerSide"),
+    Some("AssemblerSide"),
+    Some("AssemblerSide"),
+    Some("AssemblerSide")
+  )
+
+  override def registerBlockIcons(iconRegister: IIconRegister) = {
+    super.registerBlockIcons(iconRegister)
+    Textures.Assembler.iconSideAssembling = iconRegister.registerIcon(Settings.resourceDomain + ":AssemblerSideAssembling")
+    Textures.Assembler.iconSideOn = iconRegister.registerIcon(Settings.resourceDomain + ":AssemblerSideOn")
+    Textures.Assembler.iconTopOn = iconRegister.registerIcon(Settings.resourceDomain + ":AssemblerTopOn")
+  }
+
+  override def isBlockSolid(world: IBlockAccess, x: Int, y: Int, z: Int, side: ForgeDirection) = side == ForgeDirection.DOWN
+
+  override def isSideSolid(world: IBlockAccess, x: Int, y: Int, z: Int, side: ForgeDirection) = side == ForgeDirection.DOWN
+
+  // ----------------------------------------------------------------------- //
+
+  override def energyThroughput = Settings.get.assemblerRate
+
+  override def guiType = GuiType.Printer
+
+  override def hasTileEntity(metadata: Int) = true
+
+  override def createTileEntity(world: World, metadata: Int) = new tileentity.Printer()
+}
diff --git a/src/main/scala/li/cil/oc/common/container/Printer.scala b/src/main/scala/li/cil/oc/common/container/Printer.scala
new file mode 100644
index 000000000..c50c50acf
--- /dev/null
+++ b/src/main/scala/li/cil/oc/common/container/Printer.scala
@@ -0,0 +1,53 @@
+package li.cil.oc.common.container
+
+import cpw.mods.fml.relauncher.Side
+import cpw.mods.fml.relauncher.SideOnly
+import li.cil.oc.common.tileentity
+import li.cil.oc.util.SideTracker
+import net.minecraft.entity.player.InventoryPlayer
+
+class Printer(playerInventory: InventoryPlayer, val printer: tileentity.Printer) extends Player(playerInventory, printer) {
+  addSlotToContainer(18, 19)
+  addSlotToContainer(18, 51)
+  addSlotToContainer(152, 35)
+
+  // Show the player's inventory.
+  addPlayerInventorySlots(8, 84)
+
+  var isAssembling = false
+  var assemblyProgress = 0.0
+  var assemblyRemainingTime = 0
+
+  @SideOnly(Side.CLIENT)
+  override def updateProgressBar(id: Int, value: Int) {
+    super.updateProgressBar(id, value)
+    if (id == 0) {
+      isAssembling = value == 1
+    }
+
+    if (id == 1) {
+      assemblyProgress = value / 5.0
+    }
+
+    if (id == 2) {
+      assemblyRemainingTime = value
+    }
+  }
+
+  override def detectAndSendChanges() {
+    super.detectAndSendChanges()
+    if (SideTracker.isServer) {
+      if (isAssembling != printer.isAssembling) {
+        isAssembling = printer.isAssembling
+        sendProgressBarUpdate(0, if (isAssembling) 1 else 0)
+      }
+      val timeRemaining = printer.timeRemaining
+      if (math.abs(printer.progress - assemblyProgress) > 0.2 || assemblyRemainingTime != timeRemaining) {
+        assemblyProgress = printer.progress
+        assemblyRemainingTime = timeRemaining
+        sendProgressBarUpdate(1, (assemblyProgress * 5).toInt)
+        sendProgressBarUpdate(2, timeRemaining)
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/main/scala/li/cil/oc/common/init/Blocks.scala b/src/main/scala/li/cil/oc/common/init/Blocks.scala
index 40576f02a..396fc42b9 100644
--- a/src/main/scala/li/cil/oc/common/init/Blocks.scala
+++ b/src/main/scala/li/cil/oc/common/init/Blocks.scala
@@ -26,6 +26,7 @@ object Blocks {
     GameRegistry.registerTileEntity(classOf[tileentity.PowerConverter], Settings.namespace + "power_converter")
     GameRegistry.registerTileEntity(classOf[tileentity.PowerDistributor], Settings.namespace + "power_distributor")
     GameRegistry.registerTileEntity(classOf[tileentity.Print], Settings.namespace + "print")
+    GameRegistry.registerTileEntity(classOf[tileentity.Printer], Settings.namespace + "printer")
     GameRegistry.registerTileEntity(classOf[tileentity.Raid], Settings.namespace + "raid")
     GameRegistry.registerTileEntity(classOf[tileentity.Redstone], Settings.namespace + "redstone")
     GameRegistry.registerTileEntity(classOf[tileentity.RobotProxy], Settings.namespace + "robot")
@@ -85,5 +86,6 @@ object Blocks {
 
     // v1.5.4
     Items.registerBlock(new Print(), "print")
+    Items.registerBlock(new Printer(), "printer")
   }
 }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Print.scala b/src/main/scala/li/cil/oc/common/tileentity/Print.scala
index ad0e30924..7b1973f21 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Print.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Print.scala
@@ -3,15 +3,16 @@ package li.cil.oc.common.tileentity
 import cpw.mods.fml.relauncher.Side
 import cpw.mods.fml.relauncher.SideOnly
 import li.cil.oc.common.item.data.PrintData
+import li.cil.oc.util.ExtendedAABB
+import li.cil.oc.util.ExtendedAABB._
 import li.cil.oc.util.ExtendedNBT._
 import net.minecraft.nbt.NBTTagCompound
-import net.minecraft.util.AxisAlignedBB
 
 class Print extends traits.TileEntity {
   val data = new PrintData()
 
-  var boundsOff = unitBounds
-  var boundsOn = unitBounds
+  var boundsOff = ExtendedAABB.unitBounds
+  var boundsOn = ExtendedAABB.unitBounds
   var state = false
 
   override def canUpdate: Boolean = false
@@ -40,9 +41,9 @@ class Print extends traits.TileEntity {
   }
 
   def updateBounds(): Unit = {
-    boundsOff = data.stateOff.drop(1).foldLeft(data.stateOff.headOption.fold(unitBounds)(_.bounds))((a, b) => a.func_111270_a(b.bounds))
-    boundsOn = data.stateOn.drop(1).foldLeft(data.stateOn.headOption.fold(unitBounds)(_.bounds))((a, b) => a.func_111270_a(b.bounds))
+    boundsOff = data.stateOff.drop(1).foldLeft(data.stateOff.headOption.fold(ExtendedAABB.unitBounds)(_.bounds))((a, b) => a.func_111270_a(b.bounds))
+    if (boundsOff.volume == 0) boundsOff = ExtendedAABB.unitBounds
+    boundsOn = data.stateOn.drop(1).foldLeft(data.stateOn.headOption.fold(ExtendedAABB.unitBounds)(_.bounds))((a, b) => a.func_111270_a(b.bounds))
+    if (boundsOn.volume == 0) boundsOn = ExtendedAABB.unitBounds
   }
-
-  private def unitBounds = AxisAlignedBB.getBoundingBox(0, 0, 0, 1, 1, 1)
 }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Printer.scala b/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
new file mode 100644
index 000000000..00954516d
--- /dev/null
+++ b/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
@@ -0,0 +1,247 @@
+package li.cil.oc.common.tileentity
+
+import java.util
+
+import cpw.mods.fml.relauncher.Side
+import cpw.mods.fml.relauncher.SideOnly
+import li.cil.oc.Settings
+import li.cil.oc.api
+import li.cil.oc.api.machine.Arguments
+import li.cil.oc.api.machine.Callback
+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.util.ExtendedAABB._
+import li.cil.oc.util.ExtendedNBT._
+import li.cil.oc.util.ItemUtils
+import net.minecraft.item.ItemStack
+import net.minecraft.nbt.NBTTagCompound
+import net.minecraft.util.AxisAlignedBB
+import net.minecraftforge.common.util.ForgeDirection
+
+class Printer extends traits.Environment with traits.PowerAcceptor with traits.Inventory with traits.Rotatable with SidedEnvironment with traits.StateAware {
+  val node = api.Network.newNode(this, Visibility.Network).
+    withComponent("printer3d").
+    withConnector(Settings.get.bufferConverter).
+    create()
+
+  var data = new PrintData()
+  var isActive = false
+  var output: Option[ItemStack] = None
+  var totalRequiredEnergy = 0.0
+  var requiredEnergy = 0.0
+
+  val slotPlastic = 0
+  val slotInk = 1
+  val slotOutput = 2
+
+  // ----------------------------------------------------------------------- //
+
+  @SideOnly(Side.CLIENT)
+  override def canConnect(side: ForgeDirection) = side != ForgeDirection.UP
+
+  override def sidedNode(side: ForgeDirection) = if (side != ForgeDirection.UP) node else null
+
+  @SideOnly(Side.CLIENT)
+  override protected def hasConnector(side: ForgeDirection) = canConnect(side)
+
+  override protected def connector(side: ForgeDirection) = Option(if (side != ForgeDirection.UP) node else null)
+
+  override protected def energyThroughput = Settings.get.assemblerRate
+
+  override def currentState = {
+    if (isAssembling) util.EnumSet.of(traits.State.IsWorking)
+    else if (canAssemble) util.EnumSet.of(traits.State.CanWork)
+    else util.EnumSet.noneOf(classOf[traits.State])
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  def canAssemble = {
+    val complexity = data.stateOff.size + data.stateOn.size
+    complexity > 0 && complexity <= Settings.get.maxPrintComplexity
+  }
+
+  def isAssembling = requiredEnergy > 0
+
+  def progress = (1 - requiredEnergy / totalRequiredEnergy) * 100
+
+  def timeRemaining = (requiredEnergy / Settings.get.assemblerTickAmount / 20).toInt
+
+  // ----------------------------------------------------------------------- //
+
+  @Callback(doc = """function() -- Resets the configuration of the printer and stop printing (current job will finish).""")
+  def reset(context: Context, args: Arguments): Array[Object] = {
+    data = new PrintData()
+    isActive = false // Needs committing.
+    null
+  }
+
+  @Callback(doc = """function(value:string) -- Set a label for the block being printed.""")
+  def setLabel(context: Context, args: Arguments): Array[Object] = {
+    data.label = Option(args.optString(0, null))
+    isActive = false // Needs committing.
+    null
+  }
+
+  @Callback(doc = """function():string -- Get the current label for the block being printed.""")
+  def getLabel(context: Context, args: Arguments): Array[Object] = {
+    result(data.label.orNull)
+  }
+
+  @Callback(doc = """function(value:string) -- Set a tooltip for the block being printed.""")
+  def setTooltip(context: Context, args: Arguments): Array[Object] = {
+    data.tooltip = Option(args.optString(0, null))
+    isActive = false // Needs committing.
+    null
+  }
+
+  @Callback(doc = """function():string -- Get the current tooltip for the block being printed.""")
+  def getTooltip(context: Context, args: Arguments): Array[Object] = {
+    result(data.tooltip.orNull)
+  }
+
+  @Callback(doc = """function(minX:number, minY:number, minZ:number, maxX:number, maxY:number, maxZ:number, texture:string[, state:boolean=false]) -- Adds a shape to the printers configuration, optionally specifying whether it is for the off or on state.""")
+  def addShape(context: Context, args: Arguments): Array[Object] = {
+    if (data.stateOff.size + data.stateOn.size >= Settings.get.maxPrintComplexity) {
+      return result(null, "model too complex")
+    }
+    val minX = (args.checkInteger(0) max 0 min 16) / 16f
+    val minY = (args.checkInteger(1) max 0 min 16) / 16f
+    val minZ = (args.checkInteger(2) max 0 min 16) / 16f
+    val maxX = (args.checkInteger(3) max 0 min 16) / 16f
+    val maxY = (args.checkInteger(4) max 0 min 16) / 16f
+    val maxZ = (args.checkInteger(5) max 0 min 16) / 16f
+    val texture = args.checkString(6)
+    val state = args.optBoolean(7, false)
+
+    if (minX == maxX) throw new IllegalArgumentException("empty block")
+    if (minY == maxY) throw new IllegalArgumentException("empty block")
+    if (minZ == maxZ) throw new IllegalArgumentException("empty block")
+
+    val list = if (state) data.stateOn else data.stateOff
+    list += new PrintData.Shape(AxisAlignedBB.getBoundingBox(
+      math.min(minX, maxX),
+      math.min(minY, maxY),
+      math.min(minZ, maxZ),
+      math.max(maxX, minX),
+      math.max(maxY, minY),
+      math.max(maxZ, minZ)), texture)
+    isActive = false // Needs committing.
+
+    result(true)
+  }
+
+  @Callback(doc = """function():number -- Get the number of shapes in the current configuration.""")
+  def getShapeCount(context: Context, args: Arguments): Array[Object] = result(data.stateOff.size + data.stateOn.size)
+
+  @Callback(doc = """function():number -- Get the maximum allowed number of shapes.""")
+  def getMaxShapeCount(context: Context, args: Arguments): Array[Object] = result(Settings.get.maxPrintComplexity)
+
+  @Callback(doc = """function():boolean -- Commit and begin printing the current configuration.""")
+  def commit(context: Context, args: Arguments): Array[Object] = {
+    if (!canAssemble) {
+      return result(null, "model invalid")
+    }
+    isActive = true
+    result(true)
+  }
+
+  @Callback(doc = """function(): string, number or boolean -- The current state of the printer, `busy' or `idle', followed by the progress or model validity, respectively.""")
+  def status(context: Context, args: Arguments): Array[Object] = {
+    if (isAssembling) result("busy", progress)
+    else if (canAssemble) result("idle", true)
+    else result("idle", false)
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  override def canUpdate = isServer
+
+  // ----------------------------------------------------------------------- //
+
+  override def updateEntity() {
+    super.updateEntity()
+
+    if (world.getTotalWorldTime % Settings.get.tickFrequency == 0) {
+      if (isActive && output.isEmpty) {
+        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)
+        val totalShapes = data.stateOn.size + data.stateOff.size
+        // TODO Consume plastic (totalVolume) and ink (totalSurface).
+        totalRequiredEnergy = totalShapes * Settings.get.printShapeCost
+        requiredEnergy = totalRequiredEnergy
+        output = Option(data.createItemStack())
+        //        ServerPacketSender.sendRobotAssembling(this, assembling = true)
+      }
+
+      if (output.isDefined) {
+        val want = math.max(1, math.min(requiredEnergy, Settings.get.assemblerTickAmount * Settings.get.tickFrequency))
+        val success = Settings.get.ignorePower || node.tryChangeBuffer(-want)
+        if (success) {
+          requiredEnergy -= want
+        }
+        if (requiredEnergy <= 0) {
+          val result = getStackInSlot(slotOutput)
+          if (result == null) {
+            setInventorySlotContents(slotOutput, output.get)
+          }
+          else if (output.get.isItemEqual(result) && ItemStack.areItemStackTagsEqual(output.get, result) && result.stackSize < result.getMaxStackSize) {
+            result.stackSize += 1
+            markDirty()
+          }
+          else {
+            return
+          }
+          requiredEnergy = 0
+          output = None
+        }
+        //      ServerPacketSender.sendRobotAssembling(this, success && output.isDefined)
+      }
+    }
+  }
+
+  override def readFromNBTForServer(nbt: NBTTagCompound) {
+    super.readFromNBTForServer(nbt)
+    data.load(nbt.getCompoundTag("data"))
+    isActive = nbt.getBoolean(Settings.namespace + "active")
+    if (nbt.hasKey(Settings.namespace + "output")) {
+      output = Option(ItemUtils.loadStack(nbt.getCompoundTag(Settings.namespace + "output")))
+    }
+    totalRequiredEnergy = nbt.getDouble(Settings.namespace + "total")
+    requiredEnergy = nbt.getDouble(Settings.namespace + "remaining")
+  }
+
+  override def writeToNBTForServer(nbt: NBTTagCompound) {
+    super.writeToNBTForServer(nbt)
+    nbt.setNewCompoundTag("data", data.save)
+    nbt.setBoolean(Settings.namespace + "active", isActive)
+    output.foreach(stack => nbt.setNewCompoundTag(Settings.namespace + "output", stack.writeToNBT))
+    nbt.setDouble(Settings.namespace + "total", totalRequiredEnergy)
+    nbt.setDouble(Settings.namespace + "remaining", requiredEnergy)
+  }
+
+  @SideOnly(Side.CLIENT) override
+  def readFromNBTForClient(nbt: NBTTagCompound) {
+    super.readFromNBTForClient(nbt)
+    requiredEnergy = nbt.getDouble("remaining")
+  }
+
+  override def writeToNBTForClient(nbt: NBTTagCompound) {
+    super.writeToNBTForClient(nbt)
+    nbt.setDouble("remaining", requiredEnergy)
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  override def getSizeInventory = 3
+
+  override def getInventoryStackLimit = 64
+
+  override def isItemValidForSlot(slot: Int, stack: ItemStack) =
+    if (slot == 0)
+      true // TODO Plastic
+    else if (slot == 1)
+      true // TODO Color
+    else false
+}
diff --git a/src/main/scala/li/cil/oc/util/ExtendedAABB.scala b/src/main/scala/li/cil/oc/util/ExtendedAABB.scala
new file mode 100644
index 000000000..80ec8af81
--- /dev/null
+++ b/src/main/scala/li/cil/oc/util/ExtendedAABB.scala
@@ -0,0 +1,28 @@
+package li.cil.oc.util
+
+import net.minecraft.util.AxisAlignedBB
+
+import scala.language.implicitConversions
+
+object ExtendedAABB {
+  implicit def extendedAABB(bounds: AxisAlignedBB): ExtendedAABB = new ExtendedAABB(bounds)
+
+  def unitBounds = AxisAlignedBB.getBoundingBox(0, 0, 0, 1, 1, 1)
+
+  class ExtendedAABB(val bounds: AxisAlignedBB) {
+    def volume: Int = {
+      val sx = ((bounds.maxX - bounds.minX) * 16).round.toInt
+      val sy = ((bounds.maxY - bounds.minY) * 16).round.toInt
+      val sz = ((bounds.maxZ - bounds.minZ) * 16).round.toInt
+      sx * sy * sz
+    }
+
+    def surface: Int = {
+      val sx = ((bounds.maxX - bounds.minX) * 16).round.toInt
+      val sy = ((bounds.maxY - bounds.minY) * 16).round.toInt
+      val sz = ((bounds.maxZ - bounds.minZ) * 16).round.toInt
+      sx * sy * 2 + sx * sz * 2 + sy * sz * 2
+    }
+  }
+
+}