Fix the change toolhead command when cooling down

diff --git a/Cura/util/printerConnection/serialConnection.py b/Cura/util/printerConnection/serialConnection.py
index a33528820dd990cfddf6da04193dbe8a16ad1ba9..d70d00701fa626f6d922f60923d13d30135ce4bc 100644 (file)
--- a/Cura/util/printerConnection/serialConnection.py
+++ b/Cura/util/printerConnection/serialConnection.py
@@ -104,7 +104,7 @@ class serialConnection(printerConnectionBase.printerConnectionBase):
        def coolDown(self):
                cooldown_toolhead = "M104 S0"
                for i in range(0,3):
-                       change_toolhead = "T%d".format(i)
+                       change_toolhead = "T{}".format(i)
                        self.sendCommand(change_toolhead)
                        self.sendCommand(cooldown_toolhead)
                self.sendCommand("M140 S0") #Bed