programming tip

[22MIL2DAY]

I have gotten so many tips from the people on this forum and as jimc told me (when I sent him a private message) keep it on forum for people to learn. I started a large print (33 hours) last night and for some reason it stopped printing in the early morning hours. You can see the Jpegs of the unfinished print I woke up to this morning and the same print that I restarted after altering the G-code file. Another nice benefit is being able to add additional clamps.
The 1st thing I did was to home the axis and manually touch the extruder tip to the part and get the "Z" reading.
2nd was to open the code and search the "Z" dimensions until I found the one that was closest to it in this case I measured roughly 8mm and that told me that "; layer 42, Z = 7.9876" was the last printed so I moved to the next layer "; layer 43, Z = 8.1776" and I deleted everything from ; layer 43, Z = 8.1776 up to
;tool H0.19 W0.558
G0 X75.79 Y140.609 F7400
G0 Z0.198 F1200
G92 E0

But be sure to remove the "; layer 43, Z = 8.1776" as this line will allow only one level (layer) to print and will stop after that one layer. So remember with that next layer identified and the layer descriptor (; layer 43, Z = 8.1776) removed all will print fine.
The 3rd thing was to alter the priming function so the clamps and extra clamps were not hit.
These are the parameters that I had to alter:
G1 Y50 Z0.3 F9600 ; move forward to avoid binder clips
G1 X205 Z10 ; move off platform
G1 Z0.4 ; position nozzle
G92 E0 ; zero extruder
G1 E25 F225 ; purge nozzle
G92 E0 ; zero extruder
G1 X190 Z0.1 E1.0 F1200 ; slow wipe
G1 X180 Z0.25 ; lift


With this you have the ability to start a print from any point at which it fails and when doing large prints this is a great method to recover lost time and plastic.

[22MIL2DAY]

Well the extruder stopped feeding wire again after 4-1/2 hours of printing so no doubt I have some other problem. I did however find a caviot to add to my previous post and that is check the hieght of the failed print before you restart because like this one if you use the standard "Home all axis" command it will hit the frame at the top. I reprogrammed the "Z" homeat the other end of the "Y" axis and it's running again (3rd time)