Posible bug firmware retractions?

gloomyandy

@Tinchus I'm not sure your M207 command is correct. My understanding is that the R command specifies an additional amount to be applied on unretract, so in this case you would have retracted 1mm but the unretract would have moved 2mm thus extruding an extra 1mm of filament on each retract/unretract. I suspect that is not what you intended? I may be wrong but that is my interpretation of the following:

Rnnn positive or negative additional length to un-retract, in mm, default zero

Tinchus

@gloomyandy I didnt though about that.. The unretraction value to my understand is a value positive or negative in the cases I wanted to unretract more,less or eqyual to the retraction value. My intention was: retract 1 mm, unretract 1mm. Is not that the way it should work or as you say Im doing a terrible overextrusion because Im inretractin 1 mm + 1 extra mm?????

gloomyandy

@Tinchus As I said I'm not an expert on this but my reading of the documentation would mean you would have a 2mm unretract, which would probably explain why the print looks so bad. I think the idea is that most folks would want to have an equal retract/unretract and so M207 S1 would be all that is needed. Maybe @droftarts or @Phaedrux could clarify?

sebkritikel

@Tinchus said in Posible bug firmware retractions?:

@gloomyandy I didnt though about that.. The unretraction value to my understand is a value positive or negative in the cases I wanted to unretract more,less or eqyual to the retraction value. My intention was: retract 1 mm, unretract 1mm. Is not that the way it should work or as you say Im doing a terrible overextrusion because Im inretractin 1 mm + 1 extra mm?????

If you want to use firmware retraction, and want to retract/unretract 1mm when G10/G11 is called, all you need is

M207 S1 F1800 Z1

You do not need the ‘R’ parameter.

Tinchus

The it is my bad, sorry. I Will re test the config with this fix. IMHO I would clarify this on the documentation, si it is cristal clear, in my case since english is not my mother language, the R parameter is needed in order to stablish if I want to un retract the same, less or more than the retract amount.
Post closed, thanbk you all!

gloomyandy

@Tinchus I'd agree that the documentation is a little confusing on that topic, maybe an example of what the R option does would help @droftarts ?

droftarts

@gloomyandy at the moment M207 says:

Snnn positive length to retract, in mm
Rnnn positive or negative additional length to un-retract, in mm, default zero

I think R is fine, but S should perhaps say:

Snnn positive length to retract and un-retract, in mm

Does that make more sense @Tinchus ?

Ian

gloomyandy

@droftarts I think maybe adding an example of R being used to add (or subtract) an additional distance along with an explanation of what it is doing might clarify things as well.

Tinchus

@droftarts that would be cristal clear

droftarts

@Tinchus Done!

Ian