diff --git a/src/core/atcore.h b/src/core/atcore.h
--- a/src/core/atcore.h
+++ b/src/core/atcore.h
@@ -65,7 +65,7 @@
     Q_PROPERTY(int extruderCount READ extruderCount WRITE setExtruderCount NOTIFY extruderCountChanged)
     Q_PROPERTY(int serialTimerInterval READ serialTimerInterval WRITE setSerialTimerInterval NOTIFY serialTimerIntervalChanged)
     Q_PROPERTY(QStringList serialPorts READ serialPorts NOTIFY portsChanged)
-    Q_PROPERTY(float percentagePrinted READ percentagePrinted NOTIFY printProgressChanged)
+    Q_PROPERTY(double percentagePrinted READ percentagePrinted NOTIFY printProgressChanged)
     Q_PROPERTY(QStringList portSpeeds READ portSpeeds)
     Q_PROPERTY(QString connectedPort READ connectedPort)
     Q_PROPERTY(AtCore::STATES state READ state WRITE setState NOTIFY stateChanged)
@@ -206,7 +206,7 @@
      * @brief Return printed percentage
      * @sa printProgressChanged()
      */
-    float percentagePrinted() const;
+    double percentagePrinted() const;
 
     /**
      * @brief The temperature of the current hotend as told by the Firmware.
@@ -267,7 +267,7 @@
      * @param newProgress : Message
      * @sa percentagePrinted()
      */
-    void printProgressChanged(const float &newProgress);
+    void printProgressChanged(const double newProgress);
 
     /**
      * @brief New message was received from the printer
diff --git a/src/core/atcore.cpp b/src/core/atcore.cpp
--- a/src/core/atcore.cpp
+++ b/src/core/atcore.cpp
@@ -58,7 +58,7 @@
     QStringList commandQueue;           //!< @param commandQueue: the list of commands to send to the printer
     bool ready = false;                 //!< @param ready: True if printer is ready for a command
     QTimer *tempTimer = nullptr;        //!< @param tempTimer: timer connected to the checkTemperature function
-    float percentage;                   //!< @param percentage: print job percent
+    double percentage;                   //!< @param percentage: print job percent
     QByteArray posString;               //!< @param posString: stored string from last M114 return
     AtCore::STATES printerState;        //!< @param printerState: State of the Printer
     QStringList serialPorts;            //!< @param seralPorts: Detected serial Ports
@@ -332,7 +332,7 @@
     pushCommand(GCode::toCommand(GCode::G90));
 }
 
-float AtCore::percentagePrinted() const
+double AtCore::percentagePrinted() const
 {
     return d->percentage;
 }
diff --git a/src/core/printthread.h b/src/core/printthread.h
--- a/src/core/printthread.h
+++ b/src/core/printthread.h
@@ -59,7 +59,7 @@
     /**
      * @brief The print job's progress has changed
      */
-    void printProgressChanged(float);
+    void printProgressChanged(const double);
 
     /**
      * @brief the next command of the job
diff --git a/src/core/printthread.cpp b/src/core/printthread.cpp
--- a/src/core/printthread.cpp
+++ b/src/core/printthread.cpp
@@ -37,7 +37,7 @@
 public:
     AtCore *core = nullptr;             //!<@param core: Pointer to AtCore
     QTextStream *gcodestream = nullptr; //!<@param gcodestream: Steam the job is read from
-    float printProgress = 0;            //!<@param printProgress: Progress of the print job
+    double printProgress = 0;            //!<@param printProgress: Progress of the print job
     qint64 totalSize = 0;               //!<@param totalSize: total file size
     qint64 stillSize = 0;               //!<@param stillSize: remaining file
     QString cline;                      //!<@param cline: current line
@@ -138,7 +138,7 @@
     d->cline = d->gcodestream->readLine();
     qCDebug(PRINT_THREAD) << "Nextline:" << d->cline;
     d->stillSize -= d->cline.size() + 1; //remove read chars
-    d->printProgress = float(d->totalSize - d->stillSize) * 100.0 / float(d->totalSize);
+    d->printProgress = (d->totalSize - d->stillSize) * 100 / d->totalSize;
     qCDebug(PRINT_THREAD) << "progress:" << QString::number(d->printProgress);
     emit printProgressChanged(d->printProgress);
 
@@ -208,17 +208,17 @@
     } else if (parser.isSet(QStringLiteral("extruder temperature"))) {
         QStringList args = parser.positionalArguments().at(0).split(QLatin1Char(','));
         bool wait = !QString::compare(args.at(2).simplified(), QStringLiteral("true"), Qt::CaseInsensitive);
-        d->core->setExtruderTemp(args.at(0).toInt(), args.at(1).toInt(), wait);
+        d->core->setExtruderTemp(args.at(0).toUInt(), args.at(1).toUInt(), wait);
     } else if (parser.isSet(QStringLiteral("bed temperature"))) {
         QStringList args = parser.positionalArguments().at(0).split(QLatin1Char(','));
         bool wait = !QString::compare(args.at(1).simplified(), QStringLiteral("true"), Qt::CaseInsensitive);
-        d->core->setBedTemp(args.at(0).toInt(), wait);
+        d->core->setBedTemp(args.at(0).toUInt(), wait);
     } else if (parser.isSet(QStringLiteral("print speed"))) {
-        d->core->setPrinterSpeed(parser.positionalArguments().at(0).toInt());
+        d->core->setPrinterSpeed(parser.positionalArguments().at(0).toUInt());
     } else if (parser.isSet(QStringLiteral("fan speed"))) {
-        d->core->setFanSpeed(parser.positionalArguments().at(0).toInt(), parser.positionalArguments().at(1).toInt());
+        d->core->setFanSpeed(parser.positionalArguments().at(0).toUInt(), parser.positionalArguments().at(1).toUInt());
     } else if (parser.isSet(QStringLiteral("flow rate"))) {
-        d->core->setFlowRate(parser.positionalArguments().at(0).toInt());
+        d->core->setFlowRate(parser.positionalArguments().at(0).toUInt());
     } else if (parser.isSet(QStringLiteral("message"))) {
         d->core->showMessage(parser.positionalArguments().at(0));
     } else if (parser.isSet(QStringLiteral("command"))) {
diff --git a/unittests/atcoretests.cpp b/unittests/atcoretests.cpp
--- a/unittests/atcoretests.cpp
+++ b/unittests/atcoretests.cpp
@@ -144,7 +144,7 @@
 
 void AtCoreTests::testSerialTimerIntervalChanged()
 {
-    QSignalSpy sSpy(core, SIGNAL(serialTimerIntervalChanged(quint16)));
+    QSignalSpy sSpy(core, SIGNAL(serialTimerIntervalChanged(int)));
     QVERIFY(sSpy.isValid());
     core->setSerialTimerInterval(1000);
     core->setSerialTimerInterval(1000);