Multi layer Brim

I can’t seem to find any options in the Bambu Studio to set the brim to have more than 1 layer. When printing with ASA that brim has reduced the amount of things bend away from the plate in mid print. I have a hunch that something like a multi layer brim might help could reduce it even more. Each layer the brim gets smaller and smaller. The default I have is 5mm, perhaps at the next layer make it 4.5mm and so on.

I could be completely wrong and dumb about this yet it’s worth a shot!

Actually, that is not how it works. You would be better off increase the brim size from the default of 5mm to 10mm or more.

However, if you would like to verify this for yourself. You can do the following to simulate a brim:

  1. Lay down a first layer object by using a cube primitive and making it 0.20mm in height.
  2. Lay that under your model.
  3. Select all then right-click and hit assemble. Now you can raise your model by 0.20mm using the Move function in the toolbar which will allow you to keystroke the exact z dimension.
  4. Now in the object menu, select that that flat primitive and set the top and bottom layers to 0. Then change the infill to 80% or more.

The pattern should look like this:

Of course, I am assuming you already know that if you want to make multiple layer versions of this, just increase the height or simply CTRL-K and make a duplicate and stack the two objects on top of each other then make an assembly out of that.

Having said that, I promise you it will not work as well as increasing the brim size like I stated at the top.

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Would this “primitive cube” act like a custom first layer? This would be my first time using that type of function in the slicer. I’ve recently came to the realization that keeping filament as dry as possible is a very important task and that has yielded successful prints. That’s the extent of my knowledge of 3d printing.

Well knowing that you need to dry filament is not a bad place to start if that’s the first thing you learned in this craft. :+1:It took me a long time to learn that lesson and not accept the assumption that manufacturers actually dry their filament. I proved that again a few months back when I dried a brand-new spool of Bambu Silk. I thought it was just bad filament, and it was, but the filament performed much better after I removed nearly 3% moisture.

Yes, the cube primitive is just a shape of convenience; a cylinder or disk primitive works just as well. The key is to create something the height of one filament (0.20 height usually guarantees this). By eliminating top and bottom layers and modifying the infill, we trick the slicer into creating a surface resembling a brim, even if it doesn’t follow the base of the model.

One thing you may have discovered is that you can’t suspend a model in thin air; the slicer will drop it to the plate and auto-level. To stack items, use the vertical move function as part of an assembly. The slicer will fill in the space below with supports if enabled or flag a cantilevered overhang if you forget to turn on supports.

Here’s a trick: if you create any two objects, such as a primitive and anything else, as an assembly, the assembly follows the same behavior as any model in that if you try to move it vertically, it just falls back to the plate. However, if you select the object by itself within the assembly, the slicer will move that independently, and whatever is the lowest object will determine the base. Here’s a demonstration.

Lift cat

Now that the cat is suspended in mid air, if I have supports turned on and slice it, the slicer will place supports underneath because as far as it knows, there is plastic suspended in mid air and needs something underneath. The fact that it’s not ‘physically’ connected to the disc doesn’t matter.

Here’s an exaggerated viewpoint after I slice it. The disk is still at the bottom of the assembly and that’s where the slicer will anchor the assembly to the plate. But by independently moving the object, I can make it hover is space.

Now if I move the object, not the model to a 5mm height.

Then slice it, it starts to look more like a fake brim. Just size it accordingly for your height and you will get the desired affect of a multilayer brim.

If we place two discs in an assembly and space them apart vertically, then reduce the walls, top, and bottom layers to 0, I get a hollow shape that consists of only infill. By changing the infill to a suitable pattern, such as rectilinear, and varying the density, I achieve a ‘thick fake brim’ effect.

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This is GOLDEN information. It has helped a handful of my prints so far.

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