Brim printing over outer line PS 2.2.0  

RE: Brim printing over outer line PS 2.2.0

It was specifically designed that way. There’s a long conversation about it buried on github somewhere with about 3-5 more issues reporting it as a bug. 
you can adjust the outer line distance, it’s called a skirt and it’s located right above your brim settings in Print Settings>Skirt, distance from object. 

RE: Brim printing over outer line PS 2.2.0

Yep - I just noticed this as well.  It used to set the skirt as offset from the outer edge of the brim but now it sets it from the object.  You can work around this by adjusting the skirt offset with the distance from object parameter but I think this change of behavior really is a minor bug so I opened an issue for it.

RE: Brim printing over outer line PS 2.2.0

There are already so many identical ones raised about it and the change was actually put in the release notes between 2.1 and 2.2 so I don’t think you are going to get much traction about it. 

RE: Brim printing over outer line PS 2.2.0

Does this mean that in 2.0 the skirt was offset from the brim, the in 2.1 it became offset from the object, and 2.2 didn't correct it?

If so, the software development process seems a bit mucked up.

RE: Brim printing over outer line PS 2.2.0

I searched the github issue for reference to it and didn't find it - sigh.  In any case it seems pretty silly.  I can't think of any reason why you would want to print a skirt in the middle of the brim.  It defeats the purpose of the brim since it breaks it's continuity to some degree.  If anything they should default to no skirt if there is a brim (think this is the Simplify3D approach).  In any case it is easy to work around so no real difference but it really makes no sense.

RE: Brim printing over outer line PS 2.2.0

Some of them have been closed which is why I think you wont get much traction but :-

4024
3692
3962
4017
3679
3634
3516
3923

are all about the issue.  Frankly though as you can set the distance to be greater than the brim distance I'd rather see much more important issues looked at.

RE: Brim printing over outer line PS 2.2.0

@bob-h9

No you misunderstand.  In older versions the skirt used to be offset from the object+brim if it was set. So if you had a 20mm cube with a 5mm brim and a skirt 2mm away it would do a 32mm border (so 2mm outside the skirt). 

I cant find the github post but in response to user request(s) the functioning was changed to put it around the object without taking the brim into account.  I cant remember the original reasoning behind it (I read a lot but theres a lot to retain) but the software was specifically changed to work like that.  So for 2.2 there wasnt anything to 'fix' regarding that.  Its intended operation.  Its why several of the github issues are already closed and the rest probably will be in time.  The software process works fine as it was a user request.  

RE: Brim printing over outer line PS 2.2.0

Oh, so we have a brim, skirt, and border?

I thought my photo showed the single line very outermost border, which I frequently have, and the early part of the brim printing over it. Yes?

Or am I looking at the brim starting to print over the skirt? Then I guess my question would be, where is the outermost border?

Or does PS just have brim and skirt, and all this time, what I thought was an outermost border was in fact the skirt?

Thank you for your time and patience. I guess y'all are part of what makes Prusa printers so great. I just mentioned to my wife that I'm ready to buy my third Mk3, especially considering they are now 4-5 weeks out.

RE: Brim printing over outer line PS 2.2.0

@bob-h9

That single line (I think it actually defaults to 3 layers high) is the skirt.  It gets put down first to make sure that the extruder has time to get plastic flowing smoothly.  In PS it is not (so far as I know) optional.  The brim is optional and is generally used to improve first layer adhesion for things with small build plate contact area.  The width of the brim (including 0 for none) and the distance out from the object for the skirt are  both set in the print settings.  In the past the skirt setting for distance was from the outer edge of the brim (or if the brim width was 0 from the object).  It is now apparently always the distance from the object.  Thus what we see - if the skirt distance is less than the brim width, it appears inside the brim.  Where as in the past it would have been outside the brim.  No idea what the reasoning was for justifying this so I'll just fix my parameters.  But as I said above it seems as first blush pretty weird to want the skirt inside the brim.  The only thing I can imagine is that some folks use a much higher skirt as a sort of draft shield as the object is printing and perhaps they wanted that use of the skirt to be close to the object even if there was a brim.  The problem I have with the way it was implemented is that it actually created a discontinuity in the brim which may weaken the brim in holding down the part.  If this was the purpose of the change, then they should have had the skirt start above the brim layer so that the brim integrity wouldn't be impacted.

RE: Brim printing over outer line PS 2.2.0

Yeah some of the users do use it as a full height draft shield for stuff like ABS from what I recall.   I vaguely remember theres a github request for a tickbox to make the skirt the same height as the model as an option, because like typing in a value is so difficult and if that's what you want just type in something like 2000 into your settings.

Btw it is optional, as you can set the height to 0 and it doesn't print, but yes the default profiles have it set to 3 layers.  I constantly kick myself for forgetting to drop it down to 1 layer and I mainly use it to make sure my print area is fine and doesn't need cleaning as I find the prusa default prime line does the same job as the skirt is used for on many printers, ie to prime the extruder.

RE: Brim printing over outer line PS 2.2.0

Thanks - didn't know if setting to 0 would disable.  Pretty funny - I have the same issue as you.  Forget to set it back to 1 - why would 3 ever make sense???  It's not a heat shield and if you don't have plastic flowing by layer 2 you've got bigger issues.  I also mainly use it as an outline of my print area for cleaning or on those occasions where I need gluestick, to make sure that is covered.  I seldom use brims since there aren't too many shapes that have tiny contact areas but are tall enough to need the extra adhesion.   Where I do use them is when I print Polycarbonate of pretty much any size.  That stuff warps like crazy - particularly on larger pieces.  So every bit of adhesion you can get increases the likelihood of not having it rip itself off the build plate.  Strong stuff for when you need the strength but a pain in the a## to print successfully.

RE: Brim printing over outer line PS 2.2.0

I think I remember reading somewhere that the default skirt at 3 layers high to make it a little easier to get off the bed.

RE: Brim printing over outer line PS 2.2.0

Printing PETG on smooth PEI with skirt layer height of one makes it hard to remove without tools - with a layer height of three it can be removed without tools. Just my experience.