diff --git a/RepRaptor.pro b/RepRaptor.pro
index a900241..e3c5963 100644
--- a/RepRaptor.pro
+++ b/RepRaptor.pro
@@ -44,7 +44,8 @@ SOURCES += main.cpp\
     erroricon.cpp \
     sdwindow.cpp \
     eepromwindow.cpp \
-    parser.cpp
+    parser.cpp \
+    sender.cpp
 
 HEADERS  += mainwindow.h \
     settingswindow.h \
@@ -54,7 +55,8 @@ HEADERS  += mainwindow.h \
     sdwindow.h \
     repraptor.h \
     eepromwindow.h \
-    parser.h
+    parser.h \
+    sender.h
 
 FORMS    += mainwindow.ui \
     settingswindow.ui \
diff --git a/mainwindow.cpp b/mainwindow.cpp
index a2088be..95a5d08 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -50,7 +50,6 @@ MainWindow::MainWindow(QWidget *parent) :
     chekingSDStatus = settings.value("core/checksdstatus", 1).toBool();
     firmware = settings.value("printer/firmware", OtherFirmware).toInt();
     statusTimer.setInterval(settings.value("core/statusinterval", 3000).toInt());
-    sendTimer.setInterval(settings.value("core/senderinterval", 2).toInt());
     int size = settings.beginReadArray("user/recentfiles");
     for(int i = 0; i < size; ++i)
     {
@@ -64,9 +63,10 @@ MainWindow::MainWindow(QWidget *parent) :
     paused = false;
     readingFiles = false;
     sdprinting = false;
+    opened = false;
     sdBytes = 0;
     currentLine = 0;
-    readyRecieve = 1;
+    readyRecieve = false;
     lastRecieved = 0;
     userHistoryPos = 0;
     totalLineNum = 0;
@@ -77,37 +77,59 @@ MainWindow::MainWindow(QWidget *parent) :
     serialupdate();
 
     //Internal signal-slots
-    connect(&printer, SIGNAL(error(QSerialPort::SerialPortError)), this, SLOT(serialError(QSerialPort::SerialPortError)));
-    connect(&printer, SIGNAL(readyRead()), this, SLOT(readSerial()));
     connect(&statusTimer, SIGNAL(timeout()), this, SLOT(checkStatus()));
-    connect(&sendTimer, SIGNAL(timeout()), this, SLOT(sendNext()));
     connect(&progressSDTimer, SIGNAL(timeout()), this, SLOT(checkSDStatus()));
     connect(this, SIGNAL(eepromReady()), this, SLOT(openEEPROMeditor()));
 
     //Parser thread signal-slots and init
     qRegisterMetaType<TemperatureReadings>("TemperatureReadings");
     qRegisterMetaType<SDProgress>("SDProgress");
-    parser = new Parser();
-    parserThread = new QThread();
-    parser->moveToThread(parserThread);
-    connect(parserThread, &QThread::finished, parser, &QObject::deleteLater);
-    connect(this, &MainWindow::recievedData, parser, &Parser::parse);
-    connect(this, &MainWindow::startedReadingEEPROM, parser, &Parser::setEEPROMReadingMode);
-    connect(parser, &Parser::recievedTemperature, this, &MainWindow::updateTemperature);
-    connect(parser, &Parser::recievedOkNum, this, &MainWindow::recievedOkNum);
-    connect(parser, &Parser::recievedOkWait, this, &MainWindow::recievedWait);
-    connect(parser, &Parser::recievedSDFilesList, this, &MainWindow::initSDprinting);
-    connect(parser, &Parser::recievedEEPROMLine, this, &MainWindow::EEPROMSettingRecieved);
-    connect(parser, &Parser::recievingEEPROMDone, this, &MainWindow::openEEPROMeditor);
-    connect(parser, &Parser::recievedError, this, &MainWindow::recievedError);
-    connect(parser, &Parser::recievedSDDone, this, &MainWindow::recievedSDDone);
-    connect(parser, &Parser::recievedResend, this, &MainWindow::recievedResend);
-    connect(parser, &Parser::recievedSDUpdate, this, &MainWindow::updateSDStatus);
+    parserWorker = new Parser();
+    parserThread = new QThread(this);
+    parserWorker->moveToThread(parserThread);
+    connect(parserThread, &QThread::finished, parserWorker, &QObject::deleteLater);
+    connect(this, &MainWindow::recievedData, parserWorker, &Parser::parse);
+    connect(this, &MainWindow::startedReadingEEPROM, parserWorker, &Parser::setEEPROMReadingMode);
+    connect(parserWorker, &Parser::recievedTemperature, this, &MainWindow::updateTemperature);
+    connect(parserWorker, &Parser::recievedSDFilesList, this, &MainWindow::initSDprinting);
+    connect(parserWorker, &Parser::recievedEEPROMLine, this, &MainWindow::EEPROMSettingRecieved);
+    connect(parserWorker, &Parser::recievingEEPROMDone, this, &MainWindow::openEEPROMeditor);
+    connect(parserWorker, &Parser::recievedError, this, &MainWindow::recievedError);
+    connect(parserWorker, &Parser::recievedSDDone, this, &MainWindow::recievedSDDone);
+    connect(parserWorker, &Parser::recievedSDUpdate, this, &MainWindow::updateSDStatus);
     parserThread->start();
 
+    //Sender thread signal-slots and init
+    qRegisterMetaType<QSerialPortInfo>("QSerialPortInfo");
+    qRegisterMetaType< QVector<QString> >("QVector<QString>");
+    qRegisterMetaType<FileProgress>("FileProgress");
+    qRegisterMetaType<QSerialPort::SerialPortError>("QSerialPort::SerialPortError");
+    senderWorker = new Sender();
+    senderThread = new QThread(this);
+    senderWorker->moveToThread(senderThread);
+    connect(senderThread, &QThread::finished, senderWorker, &QObject::deleteLater);
+    connect(parserWorker, &Parser::recievedOkNum, senderWorker, &Sender::recievedOkNum);
+    connect(parserWorker, &Parser::recievedOkWait, senderWorker, &Sender::recievedOkWait);
+    connect(parserWorker, &Parser::recievedResend, senderWorker, &Sender::recievedResend);
+    connect(parserWorker, &Parser::recievedStart, senderWorker, &Sender::recievedStart);
+    connect(senderWorker, &Sender::errorRecieved, this, &MainWindow::serialError);
+    connect(senderWorker, &Sender::dataRecieved, parserWorker, &Parser::parse, Qt::QueuedConnection);
+    connect(senderWorker, &Sender::dataRecieved, this, &MainWindow::readSerial, Qt::QueuedConnection);
+    connect(senderWorker, &Sender::reportProgress, this, &MainWindow::updateFileProgress);
+    connect(this, &MainWindow::setFile, senderWorker, &Sender::setFile);
+    connect(this, &MainWindow::startPrinting, senderWorker, &Sender::startPrinting);
+    connect(this, &MainWindow::stopPrinting, senderWorker, &Sender::stopPrinting);
+    connect(this, &MainWindow::pause, senderWorker, &Sender::pause);
+    connect(this, &MainWindow::setBaudrate, senderWorker, &Sender::setBaudrate);
+    connect(this, &MainWindow::openPort, senderWorker, &Sender::openPort);
+    connect(this, &MainWindow::closePort, senderWorker, &Sender::closePort);
+    connect(this, &MainWindow::injectCommand, senderWorker, &Sender::injectCommand);
+    connect(this, &MainWindow::flushInjectionBuffer, senderWorker, &Sender::flushInjectionBuffer);
+    senderThread->start();
+
     //Timers init
     statusTimer.start();
-    sendTimer.start();
+    //sendTimer.start();
     progressSDTimer.setInterval(2500);
     if(chekingSDStatus) progressSDTimer.start();
     sinceLastTemp.start();
@@ -135,9 +157,10 @@ MainWindow::~MainWindow()
 
     //Cleanup what is left
     if(gfile.isOpen()) gfile.close();
-    if(printer.isOpen()) printer.close();
     parserThread->quit();
     parserThread->wait();
+    senderThread->quit();
+    senderThread->wait();
 
     delete ui;
 }
@@ -169,13 +192,13 @@ void MainWindow::parseFile(QString filename)
     if (gfile.open(QIODevice::ReadOnly))
     {
         QTextStream in(&gfile);
-        int n = 0;
         while (!in.atEnd())
         {
             QString line = in.readLine();
             if(!line.startsWith(";")) gcode.append(line);
         }
         gfile.close();
+        emit setFile(gcode);
         ui->fileBox->setEnabled(true);
         ui->progressBar->setEnabled(true);
         ui->sendBtn->setText("Send");
@@ -184,34 +207,6 @@ void MainWindow::parseFile(QString filename)
     }
 }
 
-bool MainWindow::sendLine(QString line)
-{
-    if(printer.isOpen())
-    {
-        if(sendingChecksum)
-        {
-            if(line.contains("M110")) totalLineNum = 0;
-
-            //Checksum algorithm from RepRap wiki
-            line = "N"+QString::number(totalLineNum)+line+"*";
-            int cs = 0;
-            for(int i = 0; line.at(i) != '*'; i++) cs = cs ^ line.at(i).toLatin1();
-            cs &= 0xff;
-            line += QString::number(cs);
-            totalLineNum++;
-        }
-        if(printer.write(line.toUtf8()+'\n'))
-        {
-            if(echo) printMsg(line + '\n');
-            return true;
-        }
-        else return false;
-    }
-
-    else return false;
-
-}
-
 void MainWindow::serialupdate()
 {
     ui->serialBox->clear();
@@ -222,9 +217,9 @@ void MainWindow::serialupdate()
 
 void MainWindow::serialconnect()
 {
-    userCommands.clear();
+    emit flushInjectionBuffer();
 
-    if(!printer.isOpen())
+    if(!opened)
     {
         foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts())
         {
@@ -235,49 +230,24 @@ void MainWindow::serialconnect()
             }
         }
 
-        printer.setPort(printerinfo);
-
-        if(printer.open(QIODevice::ReadWrite))
-        {
-
-            //Moved here to be compatible with Qt 5.2.1
-            switch(ui->baudbox->currentText().toInt())
-            {
-                case 4800:
-                printer.setBaudRate(QSerialPort::Baud4800);
-                break;
-
-                case 9600:
-                printer.setBaudRate(QSerialPort::Baud9600);
-                break;
-
-                case 115200:
-                printer.setBaudRate(QSerialPort::Baud115200);
-                break;
-
-                default:
-                printer.setBaudRate(ui->baudbox->currentText().toInt());
-                break;
-            }
-
-            printer.setFlowControl(QSerialPort::HardwareControl);
-
-            ui->connectBtn->setText("Disconnect");
-            ui->sendBtn->setDisabled(false);
-            //ui->pauseBtn->setDisabled(false);
-            ui->progressBar->setValue(0);
-            ui->controlBox->setDisabled(false);
-            ui->consoleGroup->setDisabled(false);
-            ui->statusGroup->setDisabled(false);
-            ui->actionPrint_from_SD->setEnabled(true);
-            ui->actionSet_SD_printing_mode->setEnabled(true);
-            if(firmware == Repetier) ui->actionEEPROM_editor->setDisabled(false);
-        }
+        emit setBaudrate(ui->baudbox->currentText().toInt());
+        emit openPort(printerinfo);
+        opened=true;
+        ui->connectBtn->setText("Disconnect");
+        ui->sendBtn->setDisabled(false);
+        //ui->pauseBtn->setDisabled(false);
+        ui->progressBar->setValue(0);
+        ui->controlBox->setDisabled(false);
+        ui->consoleGroup->setDisabled(false);
+        ui->statusGroup->setDisabled(false);
+        ui->actionPrint_from_SD->setEnabled(true);
+        ui->actionSet_SD_printing_mode->setEnabled(true);
+        if(firmware == Repetier) ui->actionEEPROM_editor->setDisabled(false);
     }
 
-    else if(printer.isOpen())
+    else if(opened)
     {
-        printer.close();
+        emit closePort();
 
         ui->connectBtn->setText("Connect");
         ui->sendBtn->setDisabled(true);
@@ -289,7 +259,9 @@ void MainWindow::serialconnect()
         ui->actionSet_SD_printing_mode->setDisabled(true);
         ui->statusGroup->setDisabled(true);
         ui->actionEEPROM_editor->setDisabled(false);
+        opened = false;
      }
+
 }
 
 /////////////////
@@ -298,123 +270,123 @@ void MainWindow::serialconnect()
 void MainWindow::xplus()
 {
     QString command = "G91\nG1 X" + ui->stepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::xminus()
 {
     QString command = "G91\nG1 X-" + ui->stepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::xhome()
 {
-    injectCommand("G28 X0");
+    emit injectCommand("G28 X0");
 }
 
 void MainWindow::yplus()
 {
     QString command = "G91\nG1 Y" + ui->stepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::yminus()
 {
     QString command = "G91\nG1 Y-" + ui->stepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::yhome()
 {
-    injectCommand("G28 Y0");
+    emit injectCommand("G28 Y0");
 }
 
 void MainWindow::zplus()
 {
     QString command = "G91\nG1 Z" + ui->stepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::zminus()
 {
     QString command = "G91\nG1 Z-" + ui->stepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::zhome()
 {
-    injectCommand("G28 Z0");
+    emit injectCommand("G28 Z0");
 }
 
 void MainWindow::eplus()
 {
     QString command = "G91\nG1 E" + ui->estepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::eminus()
 {
     QString command = "G91\nG1 E-" + ui->estepspin->text() + "\nG90";
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::ezero()
 {
-    injectCommand("G92 E0");
+    emit injectCommand("G92 E0");
 }
 
 void MainWindow::homeall()
 {
-    injectCommand("G28");
+    emit injectCommand("G28");
 }
 
 void MainWindow::on_sendbtn_clicked()
 {
-    injectCommand(ui->sendtext->text());
+    emit injectCommand(ui->sendtext->text());
     userHistory.append(ui->sendtext->text());
     userHistoryPos = 0;
 }
 
 void MainWindow::on_fanonbtn_clicked()
 {
-    injectCommand("M106");
+    emit injectCommand("M106");
 }
 
 void MainWindow::on_fanoffbtn_clicked()
 {
-    injectCommand("M107");
+    emit injectCommand("M107");
 }
 
 void MainWindow::on_atxonbtn_clicked()
 {
-    injectCommand("M80");
+    emit injectCommand("M80");
 }
 
 void MainWindow::on_atxoffbtn_clicked()
 {
-    injectCommand("M81");
+    emit injectCommand("M81");
 }
 
 void MainWindow::on_etmpset_clicked()
 {
     QString command = "M80\nM104 S" + ui->etmpspin->text();
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::on_etmpoff_clicked()
 {
-    injectCommand("M104 S0");
+    emit injectCommand("M104 S0");
 }
 
 void MainWindow::on_btmpset_clicked()
 {
     QString command = "M80\nM140 S" + ui->btmpspin->text();
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::on_btmpoff_clicked()
 {
-    injectCommand("M140 S0");
+    emit injectCommand("M140 S0");
 }
 
 void MainWindow::bedcenter()
@@ -425,7 +397,7 @@ void MainWindow::bedcenter()
     y = settings.value("printer/bedy", 200).toInt();
 
     QString command = "G1 X" + QString::number(x/2) + "Y" + QString::number(y/2);
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::on_speedslider_valueChanged(int value)
@@ -442,7 +414,7 @@ void MainWindow::on_speededit_textChanged(const QString &arg1)
 void MainWindow::on_speedsetbtn_clicked()
 {
     QString command = "M220 S" + QString::number(ui->speedslider->value());
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::on_flowedit_textChanged(const QString &arg1)
@@ -459,24 +431,24 @@ void MainWindow::on_flowslider_valueChanged(int value)
 void MainWindow::on_flowbutton_clicked()
 {
     QString command = "M221 S" + QString::number(ui->flowslider->value());
-    injectCommand(command);
+    emit injectCommand(command);
 }
 
 void MainWindow::on_haltbtn_clicked()
 {
     if(sending && !paused)ui->pauseBtn->click();
-    userCommands.clear();
-    injectCommand("M112");
+    emit flushInjectionBuffer();
+    emit injectCommand("M112");
 }
 
 void MainWindow::on_actionPrint_from_SD_triggered()
 {
-    injectCommand("M20");
+    emit injectCommand("M20");
 }
 
 void MainWindow::on_sendBtn_clicked()
 {
-    userCommands.clear();
+    emit flushInjectionBuffer();
     if(sending && !sdprinting)
     {
         sending = false;
@@ -485,6 +457,8 @@ void MainWindow::on_sendBtn_clicked()
         ui->pauseBtn->setDisabled(true);
         if(autolock) ui->controlBox->setChecked(true);
         paused = false;
+        emit pause(paused);
+        emit stopPrinting();
     }
     else if(!sending && !sdprinting)
     {
@@ -494,17 +468,20 @@ void MainWindow::on_sendBtn_clicked()
         ui->pauseBtn->setEnabled(true);
         if(autolock) ui->controlBox->setChecked(false);
         paused = false;
+        emit pause(paused);
+        emit startPrinting();
     }
     else if(sdprinting)
     {
         sending = false;
-        injectCommand("M24");
-        injectCommand("M27");
+        emit injectCommand("M24");
+        emit injectCommand("M27");
         ui->sendBtn->setText("Start");
         ui->pauseBtn->setText("Pause");
         ui->pauseBtn->setEnabled(true);
         if(autolock) ui->controlBox->setChecked(true);
         paused = false;
+        emit pause(paused);
     }
 
     ui->progressBar->setValue(0);
@@ -516,42 +493,34 @@ void MainWindow::on_pauseBtn_clicked()
     if(paused && !sdprinting)
     {
         paused = false;
+        emit pause(paused);
         if(autolock) ui->controlBox->setChecked(false);
         ui->pauseBtn->setText("Pause");
     }
     else if(!paused && !sdprinting)
     {
         paused = true;
+        emit pause(paused);
         if(autolock) ui->controlBox->setChecked(true);
         ui->pauseBtn->setText("Resume");
     }
     else if(sdprinting)
     {
-        injectCommand("M25");
+        emit injectCommand("M25");
     }
 }
 
 void MainWindow::on_releasebtn_clicked()
 {
-    injectCommand("M84");
+    emit injectCommand("M84");
 }
 /////////////////
 //Buttons end  //
 /////////////////
 
-void MainWindow::readSerial()
+void MainWindow::readSerial(QByteArray data)
 {
-    if(printer.canReadLine()) //Check if full line in buffer
-    {
-        QByteArray data = printer.readLine(); //Read the line
-
-        emit recievedData(data); //Send data to parser thread
-
-        if(data.startsWith("ok")) readyRecieve++;
-        else if(data.startsWith("wa")) readyRecieve=1;
-
-        printMsg(QString(data)); //echo
-    }
+    printMsg(QString(data)); //echo
 }
 
 void MainWindow::printMsg(const char* text)
@@ -575,58 +544,10 @@ void MainWindow::printMsg(QString text)
     ui->terminal->setTextCursor(cursor);
 }
 
-
-
-void MainWindow::sendNext()
-{
-    if(printer.isWritable())
-    {
-        if(resendLineNum != -1)
-        {
-            if(gcode.isEmpty()) sendLine("M110 N0");
-            else sendLine(gcode.at(resendLineNum));
-            resendLineNum = -1;
-
-            return;
-        }
-        if(!userCommands.isEmpty() && readyRecieve > 0) //Inject user command
-        {
-            sendLine(userCommands.dequeue());
-            readyRecieve--;
-            return;
-        }
-        else if(sending && !paused && readyRecieve > 0 && !sdprinting) //Send line of gcode
-        {
-            if(currentLine >= gcode.size()) //check if we are at the end of array
-            {
-                sending = false;
-                currentLine = 0;
-                ui->sendBtn->setText("Send");
-                ui->pauseBtn->setDisabled(true);
-                ui->filelines->setText(QString::number(gcode.size())
-                                       + QString("/")
-                                       + QString::number(currentLine)
-                                       + QString(" Lines"));
-                if(sendingChecksum) injectCommand("M110 N0");
-                return;
-            }
-            sendLine(gcode.at(currentLine));
-            currentLine++;
-            readyRecieve--;
-
-            ui->filelines->setText(QString::number(gcode.size())
-                                + QString("/")
-                                + QString::number(currentLine)
-                                + QString(" Lines"));
-            ui->progressBar->setValue(((float)currentLine/gcode.size()) * 100);
-        }
-    }
-}
-
 void MainWindow::checkStatus()
 {
     if(checkingTemperature
-            &&(sinceLastTemp.elapsed() > statusTimer.interval())) injectCommand("M105");
+            &&(sinceLastTemp.elapsed() > statusTimer.interval())) emit injectCommand("M105");
 }
 
 void MainWindow::on_checktemp_stateChanged(int arg1)
@@ -649,11 +570,6 @@ void MainWindow::on_actionAbout_triggered()
     aboutwindow.exec();
 }
 
-void MainWindow::injectCommand(QString command)
-{
-    if(!userCommands.contains(command)) userCommands.enqueue(command);
-}
-
 void MainWindow::updateRecent()
 {
     if(!recentFiles.isEmpty()) //If array is empty we should not be bothered
@@ -678,11 +594,12 @@ void MainWindow::serialError(QSerialPort::SerialPortError error)
     if(error == QSerialPort::NoError) return;
     if(error == QSerialPort::NotOpenError) return; //this error is internal
 
-    if(printer.isOpen()) printer.close();
+    emit closePort();
 
     if(sending) paused = true;
+    emit pause(paused);
 
-    userCommands.clear();
+    emit flushInjectionBuffer();
 
     ui->connectBtn->setText("Connect");
     ui->sendBtn->setDisabled(true);
@@ -692,6 +609,7 @@ void MainWindow::serialError(QSerialPort::SerialPortError error)
     ui->actionPrint_from_SD->setDisabled(true);
     ui->actionSet_SD_printing_mode->setDisabled(true);
     ui->actionEEPROM_editor->setDisabled(true);
+    opened = false;
 
     qDebug() << error;
 
@@ -772,8 +690,8 @@ void MainWindow::selectSDfile(QString file)
     ui->sendBtn->setText("Start");
     sdBytes = bytes.toDouble();
 
-    userCommands.clear();
-    injectCommand("M23 " + filename);
+    emit flushInjectionBuffer();
+    emit injectCommand("M23 " + filename);
     sdprinting = true;
     ui->fileBox->setDisabled(false);
 }
@@ -793,7 +711,7 @@ void MainWindow::updateSDStatus(SDProgress p)
 void MainWindow::checkSDStatus()
 {
     if(sdprinting && chekingSDStatus && sinceLastSDStatus.elapsed() > progressSDTimer.interval())
-        injectCommand("M27");
+        emit injectCommand("M27");
 }
 
 void MainWindow::on_stepspin_valueChanged(const QString &arg1)
@@ -818,16 +736,16 @@ void MainWindow::on_actionSet_SD_printing_mode_triggered()
 
 void MainWindow::requestEEPROMSettings()
 {
-    userCommands.clear();
+    emit flushInjectionBuffer();
     EEPROMSettings.clear();
 
     switch(firmware)
     {
     case Marlin:
-        injectCommand("M503");
+        emit injectCommand("M503");
         break;
     case Repetier:
-        injectCommand("M205");
+        emit injectCommand("M205");
         break;
     case OtherFirmware:
         return;
@@ -853,22 +771,22 @@ void MainWindow::openEEPROMeditor()
 
 void MainWindow::sendEEPROMsettings(QStringList changes)
 {
-    userCommands.clear();
+    emit flushInjectionBuffer();
     foreach (QString str, changes)
     {
-        injectCommand(str);
+        emit injectCommand(str);
     }
 }
 
 void MainWindow::recievedOkNum(int num)
 {
-    readyRecieve++;
+    readyRecieve=true;
     lastRecieved = num;
 }
 
 void MainWindow::recievedWait()
 {
-    readyRecieve = 1;
+    readyRecieve = true;
 }
 
 void MainWindow::EEPROMSettingRecieved(QString esetting)
@@ -892,10 +810,38 @@ void MainWindow::recievedSDDone()
 
 void MainWindow::recievedResend(int num)
 {
-    if(!sendingChecksum) currentLine--;
+    if(!sendingChecksum) emit injectCommand("M110 N0");
     else resendLineNum = num;
 }
 
+void MainWindow::recievedStart()
+{
+    readyRecieve = true;
+}
+
+void MainWindow::updateFileProgress(FileProgress p)
+{
+    if(p.P >= p.T)
+    {
+        ui->sendBtn->setText("Send");
+        ui->pauseBtn->setDisabled(true);
+        sending = false;
+        paused = false;
+        emit pause(paused);
+    }
+    else
+    {
+        ui->sendBtn->setText("Stop");
+        ui->pauseBtn->setEnabled(true);
+        sending = true;
+    }
+    ui->filelines->setText(QString::number(p.P)
+                        + QString("/")
+                        + QString::number(p.T)
+                        + QString(" Lines"));
+    ui->progressBar->setValue(((float)p.P/p.T) * 100);
+}
+
 bool MainWindow::eventFilter(QObject *obj, QEvent *event)
 {
     if(obj == ui->sendtext && !userHistory.isEmpty())
diff --git a/mainwindow.h b/mainwindow.h
index ea21ac5..83c8f64 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -21,6 +21,7 @@
 #include "repraptor.h"
 #include "eepromwindow.h"
 #include "parser.h"
+#include "sender.h"
 
 using namespace RepRaptor;
 
@@ -36,14 +37,15 @@ public:
     explicit MainWindow(QWidget *parent = 0);
     ~MainWindow();
 
-    Parser *parser;
+    Parser *parserWorker;
+    Sender *senderWorker;
     QThread *parserThread;
+    QThread *senderThread;
 
 protected:
     QFile gfile;
     QVector<QString> gcode;
     QQueue <QString> userCommands;
-    QTimer sendTimer;
     QTimer progressSDTimer;
     QTimer statusTimer;
     QElapsedTimer sinceLastTemp;
@@ -59,10 +61,11 @@ protected:
 private:
     Ui::MainWindow *ui;
 
-    QSerialPort printer;
     QSerialPortInfo printerinfo;
+    bool opened;
     bool firstrun;
     bool autolock;
+    bool printing;
     bool sending;
     bool paused;
     bool checkingTemperature;
@@ -74,7 +77,7 @@ private:
     int firmware;
     long int currentLine;
     unsigned long int lastRecieved;
-    int readyRecieve;
+    bool readyRecieve;
     unsigned long int totalLineNum;
     long int resendLineNum;
     int userHistoryPos;
@@ -84,14 +87,11 @@ private slots:
     void open();
     void serialconnect();
     void serialupdate();
-    bool sendLine(QString line);
-    void readSerial();
+    void readSerial(QByteArray data);
     void printMsg(QString text);
     void printMsg(const char* text);
-    void sendNext();
     void checkStatus();
     void updateRecent();
-    void injectCommand(QString command);
     void initSDprinting(QStringList sdFiles);
     void selectSDfile(QString file);
     void checkSDStatus();
@@ -106,8 +106,10 @@ private slots:
     void recievedError();
     void recievedSDDone();
     void recievedResend(int num);
+    void recievedStart();
     void parseFile(QString filename);
     void recentClicked();
+    void updateFileProgress(FileProgress);
 
     void xplus();
     void yplus();
@@ -158,6 +160,16 @@ signals:
     void eepromReady();
     void recievedData(QByteArray);
     void startedReadingEEPROM();
+
+    void openPort(QSerialPortInfo i);
+    void closePort();
+    void startPrinting();
+    void stopPrinting();
+    void pause(bool p);
+    void setBaudrate(int b);
+    void setFile(QVector <QString> f);
+    void injectCommand(QString command);
+    void flushInjectionBuffer();
 };
 
 #endif // MAINWINDOW_H
diff --git a/mainwindow.ui b/mainwindow.ui
index dff62a8..20ede34 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -304,7 +304,7 @@
         <widget class="QLineEdit" name="flowedit">
          <property name="font">
           <font>
-           <pointsize>13</pointsize>
+           <pointsize>9</pointsize>
           </font>
          </property>
          <property name="text">
@@ -1117,7 +1117,7 @@ STOP</string>
      <x>0</x>
      <y>0</y>
      <width>791</width>
-     <height>22</height>
+     <height>20</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuFile">
diff --git a/parser.cpp b/parser.cpp
index ff763bc..84718c4 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -65,7 +65,7 @@ void Parser::parse(QByteArray data)
             else emit recievedOkNum(0);
         }
         */
-        else if(data.startsWith("T:") || data.startsWith("ok T:"))
+        else if(data.contains("T:"))
         {
             TemperatureReadings r;
 
@@ -81,8 +81,8 @@ void Parser::parse(QByteArray data)
             emit recievedTemperature(r);
         }
         //else if(data.startsWith("wait")) emit recievedOkWait();
-        else if(data.startsWith("rs") || data.startsWith("Resend"))
-            emit recievedResend(data.split(' ').at(0).toInt());
+        else if(data.startsWith("rs") || data.toLower().startsWith("resend"))
+            emit recievedResend(data.split(':').at(1).toInt());
         else if(data.startsWith("!!")) emit recievedError();
         else if(data.startsWith("Done")) emit recievedSDDone();
         else if(data.startsWith("start")) emit recievedStart();
diff --git a/repraptor.h b/repraptor.h
index 020ee28..807f401 100644
--- a/repraptor.h
+++ b/repraptor.h
@@ -28,6 +28,11 @@ namespace RepRaptor
     {
         unsigned long int progress, total;
     } SDProgress;
+
+    typedef struct
+    {
+        unsigned int T, P;
+    } FileProgress;
 }
 
 #endif // REPRAPTOR_H
diff --git a/sender.cpp b/sender.cpp
new file mode 100644
index 0000000..0b9ff4e
--- /dev/null
+++ b/sender.cpp
@@ -0,0 +1,205 @@
+#include "sender.h"
+
+Sender::Sender(QObject *parent) : QObject(parent)
+{
+    //Initial values
+    currentLine=0;
+    totalLineNum=0;
+    baudrate=115200;
+    sendingChecksum=false;
+    paused=false;
+    sending=false;
+    readyRecieve = false;
+    printer = new QSerialPort(this);
+
+    //Fetch settings
+    QSettings settings;
+    sendTimer.setInterval(settings.value("core/senderinterval", 2).toInt());
+    sendingChecksum = settings.value("core/checksums", 0).toBool();
+
+    sendTimer.start();
+
+    connect(printer, SIGNAL(error(QSerialPort::SerialPortError)), this, SLOT(recievedError(QSerialPort::SerialPortError)));
+    connect(printer, &QSerialPort::readyRead, this, &Sender::recievedData);
+    connect(&sendTimer, &QTimer::timeout, this, &Sender::sendNext);
+}
+
+Sender::~Sender()
+{
+    closePort();
+    sendTimer.stop();
+}
+
+//Mainloop of sending
+void Sender::sendNext()
+{
+    if(printer->isWritable())
+    {
+        if(!userCommands.isEmpty() && readyRecieve) //Inject user command
+        {
+            sendLine(userCommands.dequeue());
+            readyRecieve = false;
+            return;
+        }
+        else if(sending && !paused && readyRecieve) //Send line of gcode
+        {
+            FileProgress p;
+            if(currentLine >= gcode.size()) //check if we are at the end of array
+            {
+                sending = false;
+                currentLine = 0;
+                if(sendingChecksum) sendLine("M110 N0");
+
+                p.P = gcode.size();
+                p.T = gcode.size();
+                emit reportProgress(p);
+
+                return;
+            }
+            sendLine(gcode.at(currentLine));
+            currentLine++;
+            readyRecieve=false;
+
+            p.P = currentLine;
+            p.T = gcode.size();
+            emit reportProgress(p);
+        }
+    }
+}
+
+bool Sender::sendLine(QString line)
+{
+    if(printer->isOpen())
+    {
+        if(sendingChecksum)
+        {
+            if(line.contains("M110")) totalLineNum = 0;
+
+            //Checksum algorithm from RepRap wiki
+            line = "N"+QString::number(totalLineNum)+line+"*";
+            int cs = 0;
+            for(int i = 0; line.at(i) != '*'; i++) cs = cs ^ line.at(i).toLatin1();
+            cs &= 0xff;
+            line += QString::number(cs);
+            totalLineNum++;
+        }
+        if(printer->write(line.toUtf8()+'\n')) return true;
+        else return false;
+    }
+    else return false;
+}
+
+void Sender::openPort(QSerialPortInfo i)
+{
+    printer->setPort(i);
+
+    if(!printer->isOpen() && printer->open(QIODevice::ReadWrite))
+    {
+
+        //Moved here to be compatible with Qt 5.2.1
+        switch(baudrate)
+        {
+            case 4800:
+            printer->setBaudRate(QSerialPort::Baud4800);
+            break;
+
+            case 9600:
+            printer->setBaudRate(QSerialPort::Baud9600);
+            break;
+
+            case 115200:
+            printer->setBaudRate(QSerialPort::Baud115200);
+            break;
+
+            default:
+            printer->setBaudRate(baudrate);
+            break;
+        }
+
+        printer->setFlowControl(QSerialPort::HardwareControl);
+    }
+}
+
+void Sender::closePort()
+{
+    if(printer->isOpen()) printer->close();
+}
+
+void Sender::startPrinting()
+{
+    currentLine = 0;
+    paused = false;
+    sending = true;
+}
+
+void Sender::stopPrinting()
+{
+    currentLine = 0;
+    paused = false;
+    sending = false;
+}
+
+void Sender::pause(bool p)
+{
+    paused = p;
+}
+
+void Sender::setBaudrate(int b)
+{
+    baudrate = b;
+}
+
+void Sender::setFile(QVector <QString> f)
+{
+    gcode = f;
+}
+
+void Sender::injectCommand(QString command)
+{
+    userCommands.enqueue(command);
+}
+
+void Sender::recievedOkWait()
+{
+    readyRecieve = true;
+}
+
+void Sender::recievedOkNum(int)
+{
+    readyRecieve = true;
+}
+
+void Sender::recievedStart()
+{
+    readyRecieve = true;
+}
+
+void Sender::flushInjectionBuffer()
+{
+    userCommands.clear();
+}
+
+void Sender::recievedResend(int)
+{
+
+}
+
+void Sender::recievedData()
+{
+    if(printer->canReadLine())
+    {
+        QByteArray data = printer->readLine();
+        if(data == "") return;
+        emit dataRecieved(data);
+        if(data.startsWith("ok") || data.startsWith("wa")) readyRecieve=true;
+    }
+}
+
+void Sender::recievedError(QSerialPort::SerialPortError error)
+{
+    if(error > 0)
+    {
+        closePort();
+        emit errorRecieved(error);
+    }
+}
diff --git a/sender.h b/sender.h
new file mode 100644
index 0000000..9a1b5b6
--- /dev/null
+++ b/sender.h
@@ -0,0 +1,67 @@
+#ifndef SENDER_H
+#define SENDER_H
+
+#include <QObject>
+#include <QSerialPort>
+#include <QSerialPortInfo>
+#include <QQueue>
+#include <QTimer>
+#include <QSettings>
+#include <QVector>
+
+#include "repraptor.h"
+
+using namespace RepRaptor;
+
+class Sender : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Sender(QObject *parent = 0);
+    ~Sender();
+
+    QSerialPort *printer;
+
+protected:
+    int currentLine;
+    int totalLineNum;
+    int baudrate;
+    bool paused;
+    bool sending;
+    bool readyRecieve;
+    bool sendingChecksum;
+    QTimer sendTimer;
+    QQueue <QString> userCommands;
+    QStringList sentCommands;
+    QVector <QString> gcode;
+
+    bool sendLine(QString s);
+
+signals:
+    void errorRecieved(QSerialPort::SerialPortError error);
+    void dataRecieved(QByteArray data);
+    void reportProgress(FileProgress p);
+
+public slots:
+    void openPort(QSerialPortInfo i);
+    void closePort();
+    void startPrinting();
+    void stopPrinting();
+    void pause(bool p);
+    void setBaudrate(int b);
+    void setFile(QVector <QString> f);
+    void injectCommand(QString);
+    void flushInjectionBuffer();
+
+    void recievedOkWait();
+    void recievedOkNum(int);
+    void recievedStart();
+    void recievedResend(int);
+
+    void sendNext();
+
+    void recievedData();
+    void recievedError(QSerialPort::SerialPortError error);
+};
+
+#endif // SENDER_H