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New Purge Line - Better, but cause a new issue  

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NoVolumeSwitch
(@novolumeswitch)
Active Member
New Purge Line - Better, but cause a new issue

So the new purge line is better, but does anyone else see a problem with filament getting stuck to the nozzle. When it squeezes out the initial blob, the z axis does not raise, resulting in melted filament getting stuck around the opening of the nozzle  I have found that during the print, the filament on the nozzle can come loose and then merge in to the print.

Prusa, why don’t you raise the z axis when the blob comes out, and then lower the z back to where it was as the nozzle continues to travel in the X direction as it continues the purge?

 

Thanks, and keep up the awesome work guys!

Best Answer by Patrick McNamara:

@novolumeswitch

;go outside print area
G1 Y-3.0 F1000.0  ; Move the extruder to Y=-3.0,  move at speed 1000mm/minute.
G1 Z0.4 F1000.0 ;Move the extruder to 0.4mm above the print surface
; select extruder
Tc
; purge line
G1 X55.0 F2000.0 ; Move the extruder to X=55mm
G1 Z0.3 F1000.0;  Move the extruder to Z=0.3mm
G92 E0.0;  set current extruder position to 0.  Does not extrude.
G1 X240.0 E25.0 F2200.0 ; move the extruder to X=240mm, while extruding 25mm of filament
G1 Y-2.0 F1000.0; move the extruder to Y=-2.0mm
G1 X55.0 E25 F1400.0 ;move to X=55 while extruding 25mm of filament.
G1 Z0.20 F1000.0; move to Z=0.2mm.
G1 X5.0 E4.0 F1000.0; move to X=5mm, while extruding 4mm of filament.


M221 S{if layer_height<0.075}100{else}95{endif}
G92 E0.0
It looks like you have multiple sets of purge line gcode intermixed.  Definitely would result in a weird purge line.  You might want to click on the little lock above the start g-code section to reset it to the default.  Save what's in there now, first, of course.
Posted : 30/05/2020 10:22 am
jweaver
(@jweaver)
Honorable Member
RE: New Purge Line - Better, but cause a new issue

New purge line?? When did that get introduced? Is that a Slic3r thing?  I havnt' noticed a change...

Posted : 30/05/2020 11:06 am
NoVolumeSwitch
(@novolumeswitch)
Active Member
Topic starter answered:
RE: New Purge Line - Better, but cause a new issue

Maybe it was a sliver thing then. It used to be a short line, now it’s a blob and then it goes all the way to the right, and then all the way back to the left before printing. 

Posted : 30/05/2020 11:10 am
Patrick McNamara
(@patrick-mcnamara)
Estimable Member
RE: New Purge Line - Better, but cause a new issue
Posted by: @novolumeswitch

So the new purge line is better, but does anyone else see a problem with filament getting stuck to the nozzle. When it squeezes out the initial blob, the z axis does not raise, resulting in melted filament getting stuck around the opening of the nozzle  I have found that during the print, the filament on the nozzle can come loose and then merge in to the print.

Prusa, why don’t you raise the z axis when the blob comes out, and then lower the z back to where it was as the nozzle continues to travel in the X direction as it continues the purge?

 

Thanks, and keep up the awesome work guys!

The purge line is defined in the Printer Settings, Custom G-code, Start Gcode.  In PrusaSlicer 2.2.0, the default purge line code is


G1 Y-3.0 F1000.0 ; go outside print area
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0

Posted : 30/05/2020 12:12 pm
NoVolumeSwitch
(@novolumeswitch)
Active Member
Topic starter answered:
RE: New Purge Line - Better, but cause a new issue

I have this in: Printer Settings, Custom G-code, Start Gcode. Using PrusaSlicer 2.2.0

I don't understand this at the moment as I am new to 3D printing, so I will go and learn about G Code.

;go outside print area
G1 Y-3.0 F1000.0
G1 Z0.4 F1000.0
; select extruder
Tc
; purge line
G1 X55.0 F2000.0
G1 Z0.3 F1000.0
G92 E0.0
G1 X240.0 E25.0 F2200.0
G1 Y-2.0 F1000.0
G1 X55.0 E25 F1400.0
G1 Z0.20 F1000.0
G1 X5.0 E4.0 F1000.0

M221 S{if layer_height<0.075}100{else}95{endif}
G92 E0.0

Posted : 30/05/2020 12:25 pm
Patrick McNamara
(@patrick-mcnamara)
Estimable Member
RE: New Purge Line - Better, but cause a new issue

@novolumeswitch

;go outside print area
G1 Y-3.0 F1000.0  ; Move the extruder to Y=-3.0,  move at speed 1000mm/minute.
G1 Z0.4 F1000.0 ;Move the extruder to 0.4mm above the print surface
; select extruder
Tc
; purge line
G1 X55.0 F2000.0 ; Move the extruder to X=55mm
G1 Z0.3 F1000.0;  Move the extruder to Z=0.3mm
G92 E0.0;  set current extruder position to 0.  Does not extrude.
G1 X240.0 E25.0 F2200.0 ; move the extruder to X=240mm, while extruding 25mm of filament
G1 Y-2.0 F1000.0; move the extruder to Y=-2.0mm
G1 X55.0 E25 F1400.0 ;move to X=55 while extruding 25mm of filament.
G1 Z0.20 F1000.0; move to Z=0.2mm.
G1 X5.0 E4.0 F1000.0; move to X=5mm, while extruding 4mm of filament.


M221 S{if layer_height<0.075}100{else}95{endif}
G92 E0.0
It looks like you have multiple sets of purge line gcode intermixed.  Definitely would result in a weird purge line.  You might want to click on the little lock above the start g-code section to reset it to the default.  Save what's in there now, first, of course.
Posted : 30/05/2020 6:29 pm
NoVolumeSwitch
(@novolumeswitch)
Active Member
Topic starter answered:
RE: New Purge Line - Better, but cause a new issue

@william-m51

Brilliant. Thanks for your help. 

Posted : 30/05/2020 8:53 pm
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