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Prusa i3 printing wrong direction

Posted by Wardru 
Prusa i3 printing wrong direction
March 30, 2016 10:00PM
Hello,

I have a problem with my printer. I built everything and tested it.

Everything is homing fine, no problems in that. I have my 0,0,0 position at right, backwards, bottom.

But when I start printing, after the homing, it tries to go the wrong direction. Indeed when it should go left, towards, it tries to push on right and backwards. It's like if my printer tries to do the opposite.

I shared my code and here is a piece of the gcode I want to print.

Thanks for your help.

; generated by Slic3r 1.2.9 on 2016-03-30 at 19:48:48

; external perimeters extrusion width = 0.40mm
; perimeters extrusion width = 0.48mm
; infill extrusion width = 0.48mm
; solid infill extrusion width = 0.48mm
; top infill extrusion width = 0.48mm

M107
M190 S70 ; set bed temperature
M104 S200 ; set temperature
G28 ; home all axes
G1 Z5 F5000 ; lift nozzle

M109 S200 ; wait for temperature to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
G1 Z0.350 F7800.000
G1 E-1.00000 F2400.00000
G92 E0
G1 X84.915 Y85.753 F7800.000
G1 E1.00000 F2400.00000
G1 X86.668 Y84.274 E1.20854 F1800.000
G1 X88.820 Y83.481 E1.41708
G1 X90.000 Y83.375 E1.52479
G1 X110.000 Y83.375 E3.34339
G1 X112.259 Y83.772 E3.55193
G1 X114.247 Y84.915 E3.76047 F1800.000
G1 X115.726 Y86.668 E3.96901
G1 X116.519 Y88.820 E4.17755
G1 X116.625 Y90.000 E4.28526
G1 X116.625 Y110.000 E6.10386
G1 X116.228 Y112.259 E6.31240
G1 X115.085 Y114.247 E6.52094
G1 X113.332 Y115.726 E6.72948
G1 X111.180 Y116.519 E6.93803
G1 X110.000 Y116.625 E7.04573
G1 X90.000 Y116.625 E8.86433
G1 X87.741 Y116.228 E9.07287
G1 X85.753 Y115.085 E9.28141
G1 X84.274 Y113.332 E9.48995
G1 X83.481 Y111.180 E9.69850
G1 X83.375 Y110.000 E9.80620
G1 X83.375 Y90.000 E11.62480
G1 X83.772 Y87.741 E11.83334
G1 X84.886 Y85.805 E12.03642
G1 E11.03642 F2400.00000
G92 E0
Attachments:
open | download - Marlin.ino (1.8 KB)
Re: Prusa i3 printing wrong direction
March 30, 2016 10:47PM
Hi, welcome to the forum.

You can put the origin wherever you want, but the most common practice is to have 0,0,0 as the bottom front left of the coordinate space as you look at the printer. I suspect that the comments in the firmware assume that orientation and may have confused you if you are thinking about 0,0 being at the back right.
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