Modify GCode to restart 3D Print

• Load GCode in text editor
• Find lines like Z0.*:

;LAYER:0
M107
G0 F8400 X9.53 Y-66.192 Z0.4

The first line with Z0.* is the initial layer height and would start the full print.

Now search for the line with Z=*.* where *.* is closest to the already printed height. If in doubt, use a slightly lower height (max 1-2 layers!) or the resumed print will not stick well to the part already printed.

Note down the extruder relative position E*.* before that line. Should look like this one (if measured height is 30.4 mm):

G1 F1500 E440.37857
G0 F600 X44.668 Y-41.761 Z30.4

Replace all lines between the first Z0.* line up to before the one with the current print height with the extruder initialization command "G92 E*.*". Use the noted value, e.g.:

G92 E440.37857

The new start (not counting initialization code) should now look like this:

;LAYER:0
M107

G92 E440.37857

G0 F600 X44.668 Y-41.761 Z30.4

Finally check for any lines in the initialization code before the Z0.* line thet use a Z value below the current print height (for nose wiping or similar, and remove them or modify the values to above the printed part. E.g from:

G1 Z15.0 F9000 ;move the platform down 15mm

To ~15mm above the print height:

G1 Z45.0 F9000 ;move the platform down 15mm

Save and start print with that gcode...