G28 X0 extrudes filament after G92 E0

[AlanKilian]

If the extruder is zereod before performing an axis zero on a non-Z axis, the extruder runs because the Printer::destinationSteps[E_AXIS] value does not get set to zero prior to the move.

g0 x0 y0 z100
g1 x100 e30 f2000 ; Make a move and extrude
g92 e0 ; zero the extruder
g28 x0 ; Move to X=0 and home

This sequence causes the extruder to extrude 30mm of filament during the move to x=0

[AlanKilian]

Fix is as follows:

diff --git a/Repetier Firmware/Repetier/Printer.cpp b/Repetier Firmware/Repetier/Printer.cpp
old mode 100644
new mode 100755
index 53e413c..19bced0
--- a/Repetier Firmware/Repetier/Printer.cpp
+++ b/Repetier Firmware/Repetier/Printer.cpp
@@ -1034,6 +1034,10 @@ void Printer::homeAxis(bool xaxis,bool yaxis,bool zaxis) // Delta homing code
// gratuitously fail due to incorrect settings.
// The following movements would be meaningless unless it was zeroed for example.
UI_STATUS_UPD(UI_TEXT_HOME_DELTA);
+

• // For all homing operations, set the extruder target position to zero to avoid extruder operation
• Printer::destinationSteps[E_AXIS] = 0;
• // Homing Z axis means that you must home X and Y
  if (homeallaxis || zaxis)
  {