diff --git a/printrun/printcore.py b/printrun/printcore.py
index 52672be3..042c94ef 100644
--- a/printrun/printcore.py
+++ b/printrun/printcore.py
@@ -416,16 +416,7 @@ def startprint(self, gcode, startindex = 0):
             return True
 
         self.clear = False
-        
-        '''Reset Gcode line number for printer, pls. see issue #1421.
-           Actual Prusa firmware >3.12.x needs "M110 N-1"
-           Smoothieware firmware needs "N-1 M110"
-           Old Marlin firmware 1.0.0 needs in addition line checksum
-           self._send("M110 N-1", -1, True) results in sending "N-1 M110 N-1*125" 
-           and do not harm Smoothieware and old Marlin firmware.
-           Test for Prusa is needed.
-        '''
-        self._send("M110 N-1", -1, True) #all in one if Prusa works with "N-1 M110 N-1 + checksum"
+        self._send("M110 N-1", -1, True)
 
         resuming = (startindex != 0)
         self.print_thread = threading.Thread(target = self._print,
@@ -684,16 +675,7 @@ def _sendnext(self):
             if not self.paused:
                 self.queueindex = 0
                 self.lineno = 0
-
-                '''Reset Gcode line number for printer, pls. see issue #1421.
-                   Actual Prusa firmware >3.12.x needs "M110 N-1"
-                   Smoothieware firmware needs "N-1 M110"
-                   Old Marlin firmware 1.0.0 needs in addition line checksum
-                   self._send("M110 N-1", -1, True) results in sending "N-1 M110 N-1*125" 
-                   and do not harm Smoothieware and old Marlin firmware.
-                   Test for Prusa is needed.
-                '''
-                self._send("M110 N-1", -1, True) #all in one if Prusa works with "N-1 M110 N-1 + checksum"
+                self._send("M110 N-1", -1, True)
 
     def _send(self, command, lineno = 0, calcchecksum = False):
         # Only add checksums if over serial (tcp does the flow control itself)