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slic3r / Slic3r

Open Source toolpath generator for 3D printers
https://slic3r.org/
GNU Affero General Public License v3.0
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Brim distance #2230

Closed machinekoder closed 7 years ago

machinekoder commented 10 years ago

There is no option for setting the brim distance. Printing the brim lets say 0.1mm away from the object (and maybe use some rigid filling) would make it easier to remove the brim from the finished object. Cura has a similar option.

alranel commented 9 years ago

Since the purpose of brim is to fight warping by anchoring the object better, what's the point in having an unconnected brim?!? It doesn't work in wireless mode :-P

whosawhatsis commented 9 years ago

Actually, it is easier to remove a brim if there is slightly more space between the brim and the object than between the lines of the brim. .1mm might be too much, but if the lines of the brim are firmly connected to each other (with a bit of overlap) and the brim is more loosely connected to the object, it's more likely to come off in a solid piece, whereas it otherwise sometimes breaks into smaller pieces and leaves bits of the innermost loop behind.

alranel commented 9 years ago

Yes but wouldn't such a weak connection between brim and object defeat the anti-warping purpose of brim? Warping forces are quite high, and object may detach from brim...

whosawhatsis commented 9 years ago

It's a balancing act. The important thing is that the lines of the brim need to be connected to each other more strongly than they are connected to the part to tear away cleanly. The other option would be to slightly overlap the brim lines among themselves. That might actually be a better solution...

machinekoder commented 9 years ago

Basically the connection between the object and the brim needs to be weaker than the brim itself. The idea of the brim is to prevent curling of the object. For this purpose the strenght of the brim is not important. It is important the brim is wide enought to provide enought adhesion to hold the object down.

whosawhatsis commented 9 years ago

For that purpose, the strength of the brim is not important, but for the purpose of trying to remove the brim in once piece, the strength of the brim (and the relative strength of it's connection to the print) is important.

alranel commented 9 years ago

Okay, @whosawhatsis. Will do it :)

lordofhyphens commented 7 years ago

Looking at this, the way to go would be to subtract a little more distance (like half a perimeter width) from the space where the brim should be in _make_brim?

alranel commented 7 years ago

I reduced the overlap between brim and object. Can someone try printing this? (Even if you don't run via git, we have automated builds now)

lordofhyphens commented 7 years ago

@machinekoder or @whosawhatsis could you check this please?

machinekoder commented 7 years ago

@lordofhyphens I have switched to Cura in the meantime as it worked better for my application.

lordofhyphens commented 7 years ago

@machinekoder You were the one who had asked for it. It was implemented. Please check that it works so this issue can be closed (or reworked depending on the output).

machinekoder commented 7 years ago

Okay then I will close this issue.

thiagopeixoto16 commented 7 years ago

@lordofhyphens I've noted the difference in the printed part itself then I came here to get more details. It is much better than before. Thanks

haleypearse commented 7 years ago

Any chance this could be implemented as an adjustable parameter in the brim settings? The optimal value depends on other parameters like first layer extrusion multiplier and filament type. I have it set in s3d to 0.35mm with PETg. The brim comes off like a perforated tear line in paper. This is a great solution for adhesion and warping.

Tinchus2009 commented 6 years ago

Hi... doesnt look like a good idea, seems like this would go against the purpuse of a brim. It is suposed to have a strong adhesion to the object, that s the way you gain adhesion to the bed

haleypearse commented 6 years ago

Setting a small (.1-.4mm) brim distance simply makes the brim removable by tearing off, by making it thinner where it meets the print. A brim with no distance usually needs cutting or filing around the perimeter of the print, which is never pretty. With a larger distance the brim barely joins the print, but with a heated bed and PETg this is still sufficient to hold the print in place.

Tinchus2009 commented 6 years ago

As Lord pointed, im reporting issues with brim. lease reconsider this setting, right now the brim is almos useless while printing ABS. The hole purpose of a brin is to give a strong adhesion to the bed, creating a weak conection is not good. The examples here talks about petg and so... but those material have way less cursling than ABS (actually at least to me, i dont need a brim to print petg)