New Purge Line - Better, but cause a new issue - General discussion, announcements and releases

RE: New Purge Line - Better, but cause a new issue

NoVolumeSwitch — Sat, 30 May 2020 20:53:14 +0000

@william-m51

Brilliant. Thanks for your help.

RE: New Purge Line - Better, but cause a new issue

Patrick McNamara — Sat, 30 May 2020 18:29:05 +0000

@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.

RE: New Purge Line - Better, but cause a new issue

NoVolumeSwitch — Sat, 30 May 2020 12:25:24 +0000

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

RE: New Purge Line - Better, but cause a new issue

Patrick McNamara — Sat, 30 May 2020 12:12:01 +0000

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

RE: New Purge Line - Better, but cause a new issue

NoVolumeSwitch — Sat, 30 May 2020 11:10:17 +0000

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.

RE: New Purge Line - Better, but cause a new issue

jweaver — Sat, 30 May 2020 11:06:00 +0000

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

New Purge Line - Better, but cause a new issue

NoVolumeSwitch — Sat, 30 May 2020 10:22:26 +0000

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!