Head stops after print leaving unwanted blob on print.

TRATOON

Hello,

Whenever a print finishes, the head stops right above it and then moves in like a minute leaving a blob or melted spot in print. If I keep all settings the same and print in Marlin there is no issue, so my guess is that the firmware is causing something:

End of GCODE FILE:

G1 F1206 X139.468 Y164.051 E2504.73905
G1 F2700 E2503.73905
G0 F15000 X144.707 Y164.051
G0 X153.829 Y164.051
G0 X159.069 Y164.051
G1 F2700 E2504.73905
G1 F1206 X159.069 Y144.45 E2505.38772
;TIME_ELAPSED:3872.122549 end of print?
G1 F2700 E2504.38772 ; this section causing problems???
M140 S0
M204 P500
M204 T500
M566 X600 Y600
M107
G91 ;Relative positioning My end gcode in slicer beigins here
G1 E-40 F2400 ;Retract
G1 Z15 F2400 ;Raise Z
G1 E-40 F2400 ;Retract

G90 ;Absolute positioning
G1 X290 Y315 ;Present print
M106 S0 ;Turn-off fan
M104 S0 ;Turn-off hotend
M140 S0 ;Turn-off bed

M84 X Y E ;Disable all steppers but Z
M83 ;relative extrusion mode
M104 S0
;End of Gcode

dc42

@TRATOON said in Head stops after print leaving unwanted blob on print.:

G91 ;Relative positioning My end gcode in slicer beigins here
G1 E-40 F2400 ;Retract
G1 Z15 F2400 ;Raise Z
G1 E-40 F2400 ;Retract

Add command M83 after G91. In RRF, G91 sets axis movement to relative but not extruder movement.

TRATOON

@dc42 What exactly would that command do? Also, I'm using E3D hemera direct drive are the 2 x 40 mm retractions too much? If so, what should my end Gcode look like the as soon as the print is done it moves to the corner, retracts all the filament out of the hot end, and then cools down?

dc42

@TRATOON your file has been sliced in absolute extrusion mode and the final extruder position is 2504mm. So the G1 E-40 command in your end GCode will retract 2544mm of filament, unless you use M83 to select relative extrusion first.

heathharper

This is exactly what happens when I slice for Marlin instead of RepRap in CURA.

Make sure your slicer is set to RepRap and it should automatically fix the issues as explained by everyone above.