diff --git a/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala b/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala
index 3f9ee4e5f..2046e2d7f 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala
@@ -113,16 +113,14 @@ class Assembler extends traits.Environment with traits.PowerAcceptor with traits
     super.updateEntity()
     if (output.isDefined && world.getTotalWorldTime % Settings.get.tickFrequency == 0) {
       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
-      }
+      val have = want + (if (Settings.get.ignorePower) 0 else node.changeBuffer(-want))
+      requiredEnergy -= have
       if (requiredEnergy <= 0) {
         setInventorySlotContents(0, output.get)
         output = None
         requiredEnergy = 0
       }
-      ServerPacketSender.sendRobotAssembling(this, success && output.isDefined)
+      ServerPacketSender.sendRobotAssembling(this, have > 0.5 && output.isDefined)
     }
   }
 
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Printer.scala b/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
index 9403ed7a7..36fd9a4d5 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
@@ -228,10 +228,8 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
 
     if (output.isDefined) {
       val want = math.max(1, math.min(requiredEnergy, Settings.get.printerTickAmount))
-      val success = Settings.get.ignorePower || node.tryChangeBuffer(-want)
-      if (success) {
-        requiredEnergy -= want
-      }
+      val have = want + (if (Settings.get.ignorePower) 0 else node.changeBuffer(-want))
+      requiredEnergy -= have
       if (requiredEnergy <= 0) {
         val result = getStackInSlot(slotOutput)
         if (result == null) {
@@ -247,7 +245,7 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
         requiredEnergy = 0
         output = None
       }
-      ServerPacketSender.sendPrinting(this, success && output.isDefined)
+      ServerPacketSender.sendPrinting(this, have > 0.5 && output.isDefined)
     }
 
     if (maxAmountMaterial - amountMaterial >= materialPerItem) {
diff --git a/src/main/scala/li/cil/oc/server/network/Network.scala b/src/main/scala/li/cil/oc/server/network/Network.scala
index 052f6b6bf..4d08792f0 100644
--- a/src/main/scala/li/cil/oc/server/network/Network.scala
+++ b/src/main/scala/li/cil/oc/server/network/Network.scala
@@ -392,7 +392,7 @@ private class Network private(private val data: mutable.Map[String, Network.Vert
             }
           }
         }
-        remaining
+        -remaining
       }
       else /* if (delta > 0) */ {
         var remaining = delta