Print goes right off edge.

New at this. I'm using FlashForge Creator Pro (dual) and ReplicatorG. Using Slic3r, I exported the below Ggode and opened it in ReplicatorG to print. The first test extrusion prints fine. After that, the right extruder moves to the back right of the plate and starts to print. It immediately moves off the right side of the platform. Slic3r worked before, but for the life of me I can't figure out what I screwed up. I'm using the default start/stop code from Slic3r. I have the settings set to 2 extruders, but haven't changed any offsets. Any help would be appreciated. Also, can someone tell me what the "F" and "E" numbers represent? (e.g. G1 F1800.000 E-1.00000)? Sooo much to learn.

Here's the beginning code:
T0; set primary extruder
M73 P0; enable show build progress
M109 S105 T0; heat bed up to first layer temperature
M104 S225 T0; set nozzle heater to first layer temperature
M103; disable RPM
G21; set units to mm
G162 X Y F6000; home XY axes maximum
G161 Z F9000; home Z axis minimum
G92 Z0; set Z to 0
M132 X Y Z A B; Recall stored home offsets
G90; set positioning to absolute
G1 Z30; move Z to waiting height
G1 X-95 Y-73 Z30 F14000; move to waiting position (front left corner of print bed)
G130 X0 Y0 A0 B0; set stepper motor vref to lower value while heating
M6 T0; wait for bed and extruder to heat up
G130 X127 Y127 A127 B127; set stepper motor vref to defaults
M108 T0 R3; set extruder speed
G92 E0; set E to 0
G90; use absolute coordinates
M320; acceleration enabled for all commands that follow
G1 Z0.4 F6000.000; move to first layer height
G1 X100 Y-73 F14000.000; move to front right corner of bed
G1 X-90 Y-73 E24 F2000.000; extrude a line of filament across the front edge of the bed
G4 P2000; wait for ooze to slow
G1 Z0 F6000.000; lower nozzle height to 0
G1 X-95; wipe nozzle
G1 Z0.4 F6000.000; set nozzle to first layer height
G1 F12000; ensure fast travel to first print move
G92 E0; set E to 0 again
M73 P0; reset build progress to 0
G90 ; use absolute coordinates
M73 P0
G1 F1800.000 E-1.00000
G1 Z0.400 F7800.000
G1 X105.144 Y20.176 F7800.000
G1 E0.00000 F1800.000
G1 X106.800 Y15.506 E0.58848 F600.000
G1 X107.934 Y13.495 E0.86270
G1 X109.683 Y11.987 E1.13693

Yes, it is indeed a lot to learn You can start here: [reprap.org]
Take each line of code, and figure out what is doing.

For the behavior you mentioned, I think somewhere the origin of X and/or Y are set in a wrong way.

Thanks for the response. I'll check out the Wiki and see what i can figure out from there.

Edit: Got it. For some reason, Slic3r set the center as 1/2 of the bed dimensions. I changed it to 0 and all is well now.

Edited 1 time(s). Last edit at 01/25/2015 12:03PM by Floydz.

Quote
Floydz
Thanks for the response. I'll check out the Wiki and see what i can figure out from there.

Edit: Got it. For some reason, Slic3r set the center as 1/2 of the bed dimensions. I changed it to 0 and all is well now.

Printers may either homed so that the bed center is at 0,0 (like you have), or they may set the bottom left corner of the bed to be 0,0 (so the whole bed area is positive in X and Y and center is half bed dimensions). Slic3r can be set to either system. The "F" parameter is the maximum speed of the move (note - mm per minute not mm per second, and if not present it uses the last speed set), and the "E" parameter is the length of filament to be extruded over the distance of that move (zero if not present). Extrusion moves may set to be relative or absolute.

Dave

Thanks for answering my questions Dave. That's really helpful.