Retraction problem

Hi Ormerod users (:

at the moment i have some retraction problem where the printer makes the first pair of lines i got around my print.
but when it then moves in towards the actual object it retracs the filament like 40-50 mm and just print on afterwards but Theres obviusly no filament then

anyone that knoves what might be wrong here

this is the retraction settigs at the moment

lenght 1
lift z 0
speed 30
ekstralength on restart 0
minimum travel after retraction 2
retract on layer change (yes)

Did you start from the Ormerod 0.5 profile for slic3r provided by RapRapPro? I suspect not, because it sounds to me that you don't have "Use relative E distances" checked in the printer settings and/or you don't have an M83 command in the custom start gcode.

btw the Ormerod works better with retraction increased to 4mm.

Edited 1 time(s). Last edit at 05/01/2014 05:50PM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

I hav tried your 4 mm and it looked a litle better but it still pulled the material a long lenght back when going from the outher ring to the object so the 4 in compensation did not do athing

heres my settings i think u speak about i hope u can help me from here


; RepRapPro Ormerod
; Standard configuration G Codes
M111 S1; Debug on
M550 POrmerod; Set the machine's name
M551 Preprap; Set the password
M552 P192.168.1.200; Set the IP address
M553 P255.255.255.0; Set netmask
M554 P192.168.1.1; Set the gateway
M555 P2; Emulate Marlin USB output
M92 E420; Set extruder steps/mm
G21 ; Work in mm
G90 ; Absolute positioning
M83 ; Extrusions relative
M558 P1 ; Turn Z Probe on
G31 Z1.1 P657 ; Set Z probe height and threshold
M906 X800 Y800 Z800 E800 ; Motor currents (mA)
T0 ; Select extruder 0
M557 PO X55 Y-2
M557 P1 X55 Y175
M557 P2 X230 Y175
M557 P3 X230 Y-2

See the first paragraph of my earlier reply. The settings I was referring to are the "Printer settings" in slic3r. That is where you need to select relative extruder distances. But if you didn't start from either RRP's slic3r profile, or someone else's designed for the Ormerod, there will probably be other things wrong too.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Hi Christopher R. Gcode files are text files - you can open them in any text editor. Open your gcode file, copy the first 20 or so lines out of it, and paste it here, then we can see what your settings are. dc42 is correct about the setting you most likely have to change in Slic3r.

Ian
RepRapPro tech support

Hi Ian thank's for the help here are the setings i think u speak about

; generated by Slic3r 1.0.0RC2 on 2014-05-14 at 17:26:09

; layer_height = 0.2
; perimeters = 2
; top_solid_layers = 4
; bottom_solid_layers = 3
; fill_density = 0.2
; perimeter_speed = 80
; infill_speed = 60
; travel_speed = 100
; nozzle_diameter = 0.5
; filament_diameter = 1.75
; extrusion_multiplier = 1
; perimeters extrusion width = 0.50mm
; infill extrusion width = 1.02mm
; solid infill extrusion width = 0.85mm
; top infill extrusion width = 0.85mm
; first layer extrusion width = 0.80mm

G21 ; set units to millimeters
M107
M190 S65 ; wait for bed temperature to be reached
M104 S190 ; set temperature
G28 ; home all axes
G1 Z5 F5000 ; lift nozzle
M109 S190 ; wait for temperature to be reached
G90 ; use absolute coordinates
G92 E0
M82 ; use absolute distances for extrusion
G1 Z0.400 F6000.000
G1 X61.110 Y66.310 F6000.000

Hi ChristopherR,
I don't know whether it is the cause of your problem, but I had quite a few odd things happen when Slic3r created a M190 gcode - as it was not supported in the firmware I was running.
Slic3r inserted it because I had no explicit setting for the bed temperature in my 'Custom code'

Dmould (I think) showed the Custom G-code (in the Printer Settings tab of Slic3r). I put this in, and it has worked fine (no M190 codes)
Try replacing your custom code with this - cut and paste it just as it is
Greg

G21 ; set units to millimeters
M203 X6000 Y6000 Z500 E3000 ; Allow 100mm/s speeds
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
G1 Z5 F200 ; lift nozzle
G1 X2 Y50 F2000; Go to wait for warm position
M140 S[first_layer_bed_temperature] ; Set bed heater
M116 ; Wait for everything (Bed temp)
T0; Select extruder
M104 S[first_layer_temperature]
M116; Wait for extruder temp as well for all temperatures

Edited 1 time(s). Last edit at 05/14/2014 01:39PM by GregL.

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Ormerod #17

Chris, I have told you twice what the problem is, which is that you are using absolute extruder distances. This is confirmed by the M82 command in the gcode file you posted.

Using absolute extruder distances works with my fork of the firmware (e.g. 059-dc42), but not with RRP's official firmware. But it is better to use relative extruder distances anyway, because this avoids rounding errors in the firmware.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

ok i tried with the m83 alone and with your inputs it just made my printer insane with the m83 alone in it mad two huge dots of filament on the build area and with alle the changes u
made it did not go to zero and relly just vent full speed moving around and pulled a shit load of material out in a pair of seconds so
i relly stand on bare ground with this retraction again