I have a half printed object and I would really like to be able to carry on from where it stopped printing.

Can I edit the GCODE file to remove say the first 27 layers and carry on printing the rest?

I know exactly where it stopped and it was at the end of a complete layer.

I'm using Reprap Host (Yes I know).

Do I need to have a call to make my Z axis get to the correct level, what would this value need to be? 0.4 x 27 layers ? if I wanted to start from layer 28?

Would I also need to add this first chunk of GCODE data below to the file -

; GCode generated by RepRap Java Host Software
; Created: 2010-09-19:19-50-37
G21 ;metric is good!
G90 ;absolute positioning
M140 S0.0 ;set bed temperature and return
T0; select new extruder
M113; set extruder to use pot for PWM
G92 E0 ;zero the extruded length
G28; go home
G92 E0 ;zero the extruded length
G1 F250.0; feed for start of next move
G1 Z0.5 F251.4 ;z move
G1 Z1.0 F250.0 ;z move
G1 F600.0; feed for start of next move
G1 X185.0 Y5.0 ;horizontal move
G28 Z0 ;set z 0
M109 S259.0 ;set temperature and wait
G1 E15.0; extruder dwell
G1 F8000.0; feed for start of next move
G1 E-14.7; extruder retraction
G1 F600.0; feed for start of next move
G92 E0 ;zero the extruded length

Then carry on with data from Layer 28 onwards?

Is it as easy as that? and will Reprap host handle it?

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[richrap.blogspot.com]

YES, if you move the proper GCode it should be possible to start at a specific layer number (and of course the preamble should not be deleted as you mentioned).

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

Thanks again Bob, I'm going to give it a try.

The GCode page was also a great help, it even helped me solve another issue/question I had with my Repstrap - (pause time before print - in the Firmware)

Cheers,

RichRap

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[richrap.blogspot.com]