disable parts fan during purge strip

[matt_sculley 0]

Hi, sorry if this has been covered.  I print almost exclusively in ABS on an ender 3v2 and I run my bed temp at 100 degrees C.  My issue is that with the part cooling fan running at 100%, and the purge strip being on the edge of the bed (where I suspect the temp is a bit lower), the strip doesn't get adequate adhesion.  So when the carriage does its move to the centre area, it drags the purge strip with it, which inevitably interferes/screws up the initial stage of the actual print.

Is there a way in cura to disable the parts fan during the purge strip?  I'm fairly new to 3d printing and I'm not across editing g-code yet so I'm hoping there's an easy way in cura.

Thanks,

Matt.

[GregValiant 1,251]

In Cura - click on your printer, go to Manage Printers and then Machine Settings.  In the left lower part of the dialog is "StartUp G-Code".  The Ender 3 usually starts with the following lines:

92 E0 ; Reset Extruder

G28 ; Home all axes

G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

 

Add a line M106 S0 after the G28 line so your start Gcode looks like this:

92 E0 ; Reset Extruder

G28 ; Home all axes

M106 S0 ;shut off the cooling fan

G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

 

There should be an M106 S0 (or M107 - same thing) in your Ending Gcode as well.  The M107 is being deprecated in some firmware so M106 S0 is a better choice.

 

Doing it this way will mean that all your prints start with the cooling fan off.  Your Cura cooling settings will take effect at the start of the actual print.

[matt_sculley 0]

Hey thanks so much for this.  my ABS purge strip is now adhering properly.  I also did a quick test with PLA and the parts fan came on as per my profile settings.

Much appreciated!