Annoying Start Gcode - Clogging Hotend

HI Everyone,

I recently built a Reprap Adapto with a Geeetech metal j-head hotend, mk2 heatbed and Printrboard running Marlin firmware and Repetier Host 0.56 for Mac. After a lengthy fine tuning period it is now working exceptionally well, albeit, for one annoying bit of Gcode line that either Slicr or Repetier seems to be including (see below).

Quote
G1 F500 E35 ; 500mm/min speed of print head, 35mm filament to extrude

As you can see the extruder is told to extrude 35mm of filament at a speed of 500mm/min. Nothing really wrong with that, however, it does it whilst at 0 (zero) on the Z axis. The hotend gets clogged and I obviously need to kill the print. The 'dump area' option is disabled in Repetier.

My attempts to to work out where the gcode is being included from failed. Any ideas?

Regards,
Alex V

Edited 1 time(s). Last edit at 09/02/2014 02:58AM by AlexV.

Why not edit the gcode and remove that line?
I have to edit my gcode for BS things slicers include.

Like Floyd says, edit the start code in slicer and remove/edit the line. The start code is on the printer tab.

Incidentally, you can't look at that line in isolation and say it is extruding 35mm. If you are using absolute extrusion, and the z axis had been previously at 34mm, this line will only extrude 1mm. I believe from your observation though that it IS extruding 35mm.

Hi Floyd,

This is exactly what I do, however, I thought there might be a way to get rid of it. Below is the entire start code.

; generated by Slic3r 1.1.7 on 2014-09-02 at 14:49:57

; perimeters extrusion width = 0.40mm
; infill extrusion width = 0.42mm
; solid infill extrusion width = 0.42mm
; top infill extrusion width = 0.42mm

G21 ; set units to millimeters
M190 S110 ; wait for bed temperature to be reached
G28 ; home all axes
M109 S215 ; heat up hot end to set temperature
M82 ; use absolute distances for extrusion
G90 ; use absolute coordinates
G92 E0 ; set E value to 0 at current position
G1 F500 E35 ; 500mm/min speed of print head, 35mm filament to extrude
G92 E0 ; set E value to 0 at current position
G90 ; use absolute coordinates
G92 E0
M82 ; use absolute distances for extrusion
G1 F1800.000 E-1.00000

Like jbernardis said, in the slicer configuration under the printer tab is the start g code. You can edit that and remove the offending line. Just make sure you are slicing with that printer configuration.