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New feature: brim "ear" #4687

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supermerill opened this issue Jan 9, 2019 · 7 comments

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@supermerill
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commented Jan 9, 2019

Hi

When i embed "ears" in my model before printing, it's very hard to remove, because the printing lines aren't along the perimeter of the "real" object (especially if the bottom layer is rectilinear).

So i quickly created an option to create a brim only over "sharp" convex corners.

currently 2 new parameters:

  • ear brim (boolean)
  • max angle(float, default to 120)

I need to do a bit more work to improve the ordering of the printed gcode.

mickey_brim

What do you think of it?
Shoud i do a pr?

@VanessaE

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commented Jan 9, 2019

Definitely make a PR of this! (though I'd suggest making each ear from a continuous bead, rather than multiple parallel lines as seen here)

@supermerill

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commented Jan 9, 2019

mickey_brim2

@iosonopersia

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commented Jan 9, 2019

Hi, I think this feature could be very useful: it's a "smart brim", placed only where it's needed. I'd really like to try it!

@UticaTechClub

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commented Jan 10, 2019

Very good idea.
Brim the most susceptible to bad adhesion areas.

Correct me if I am wrong...
Implementation can be tricky on models with many sharp corners. Gears come to my mind.

@lordofhyphens

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commented Jan 10, 2019

Because of the way it is generated, I bet it would devolve to a standard brim in the gear situation.

@supermerill

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commented Jan 10, 2019

yes, it's only a mask + some post-process over the current (external) brim.

@Splarv

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commented Feb 5, 2019

Eh, I am experimenting to use PETG without hot plate ant clue. And I heavely need this. The reason is when you type continuous brim, after cooling the plastic begin shrink and brim too. And brim too begin pull corners to each other to warp corners. What I see, the wider the brim, the worth result and brim get out of plate first and begin pull corners later. And I think the "brim ears" is opposing thing. Ears will only pull corners in the opposite direction and this will bring positive and desirable effect.

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