scratches and gcode

[massimauni 0]

Hi,

I'm trying to eliminate from the surface of the tops layer the signs of some scratches, like in these pictures:

 

I bring the formulations that I use with Care 15.02.1, even if in this case I'm (almost) sure that they are superfluous:

- retraction: enabled

- minimum travel: 0.1

- combing: enabled

- minimal extrusion: 0.0

- z-hop: 0.15

In the gcode, I have looked for the lines to which correspond these scratches and I have noticed that, mainly, they happen in correspondence of G0s sequences similar to this (two-ten rows in my experience):

...

G1 X112.210 Y125.942 E1901.51616

G1 X111.906 Y125.964 E1901.52835

G0 F12000 X113.216 Y126.391

G0 X112.732 Y127.400

G1 F3600 X112.476 Y127.939 E1901.54637

G1 X112.444 Y128.536 E1901.55815

...

So I've tried to insert G10 and G11, before and later to the G0s, so that to surely stop the extrusion:

...

G1 X112.210 Y125.942 E1901.51616

G1 X111.906 Y125.964 E1901.52835

G10

G0 F12000 X113.216 Y126.391

G0 X112.732 Y127.400

G11

G1 F3600 X112.476 Y127.939 E1901.54637

G1 X112.444 Y128.536 E1901.55815

...

This solution (applied to the last one or two layers) has improved a lot because some scratches have disappeared, except someone.

A deeper analysis (using GCode Print Simulator for searching the moment of these extrusions scanning every movement) has brought me to eliminate them using the same method in other anonymous lines (without G0 sequences, but only one row for time).

Editing the first kind of G0 command is not a big problem: the changes ask for few minutes and the lines they are easily found.

More difficult and longer to find the others!

Now, my question is:

"Can someone confirm that this solution is the best way? And, more important, does exist any plugin, macro or similar that could automatize this editing?"

At disposal for any additional comment.

 

[dirkdirk 5]

Hi,

Use the Plugin "RetractWhileCombing" and the scratches are gone ;-)

[massimauni 0]

This plug-in has the same function that checking "retraction" and "combing:all" (in the last version of Cura), I suppose...

[dirkdirk 5]

I don't how it works, but the result is perfect..

[tsagos 8]

I think that if you go in retraction settings and put at combing the option : No skin that it will do the trick for you.

 

[massimauni 0]

I'm not satisfied of the "no skin" option because it lengthens a lot the printing times and the top layer results less smooth.

In this moment, I'm trying the "retractwithcombing" plugin....

 

[massimauni 0]

Just finished the plugin test....good result!

Thanks for the suggestion!

I had stopped using the plugin because my UM2 reseller had told me that it was the same thing of the two independent settings.

Very very appreciated help!!!

Regards.

(now, a look to the gcode for better understanding...)