HOW TO MAKE RADIAL SHELL ?

[Anonymous]

Hi,

When using the shell command, the shell thikness is created perpendicular to surfaces ...

For a very specific project, I need it to be radial to a vertical axis or, ideally, perpendicular to perimeters in horizontals planes.

Has anybody a way to do this ?

Best regards, Alain.

[davebYYPCU]

Copy and paste the curve, horizontal distance.

Might help....

[Anonymous]

Hi,

this will work for a single line or a planar face, but not for a complex geometry body

Here is an very simple example of what I got with shell command ( to the left) and what I expect (to the right)
the red line marks the difference.

[wmhazzard]

I am pretty sure that you cant do that for complex geometry, it would be very easy to end up with zero thickness in some areas. The offset and shell maintain constant thickness to avoid those problems. 

[jeff_strater]

@Anonymous - no, there is no option for a "directed offset" in Fusion, at least that I am aware of.  You will have to model the inside volume manually, based on the results you want.  Shell is not going to help.

[chrisplyler]

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@wmhazzard wrote:

I am pretty sure that you cant do that for complex geometry, it would be very easy to end up with zero thickness in some areas. The offset and shell maintain constant thickness to avoid those problems.

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If the geometry doesn't lend itself to offsetting radially without resulting in a zero thickness, then the original question wouldn't have been asked.

[davebYYPCU]

What complex geometry?

My profile does what you asked for, it could / can be Revolved, Swept, Extruded, and Lofted to another sketch.

[chrisplyler]

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@Anonymous wrote:

Hi,

this will work for a single line or a planar face, but not for a complex geometry body

Here is an very simple example of what I got with shell command ( to the left) and what I expect (to the right)
the red line marks the difference.

---

The geometry you showed in your first post was simple enough. What's the problem? If your actual geometry doubles back on itself or otherwise creates zero thickness or even causes the outer and inner faces to overlap, then what you described isn't physically possible in the real world anyway.

[wmhazzard]

How do you know what they would or wouldn't ask? They said their model was more complicated than the sample so how complicated is anyone's guess. I know that AD wouldn't have an option in shell do do what the OP wants because you could get a zero thickness. 

[Anonymous]

Hi,

My goal is to 3Dprint big objects with higher external and lower internal resolution by using a dual head extruder with 2 different nozzle diameters : let say one of 0.3mm to print externals layers at 0.1mm hight and the other of 0.8mm to print infill and internals ones at 0.4mm hight.

Therefor, I have to generate 2 .stl files, convert both to .gco with the slicer, and combine them with an Excel macro.

Objects that I have to print sizes 16*16*48cm, with a shell of 3.2mm and would take up to 6 days each to print.

Using this new method, it would be possible within 36 h. 

As the shell command works perpendicularly, and the slicer horizontally, it will generate some unwanted gaps !

Best regards, Alain.

[davebYYPCU]

Interesting, so for a vase, 3.2mm shell, your Slicer can't figure it out?  That's what they are for.

So you say part of the shell wall is nozzle 1 for a few rings, and the inside wall is nozzle 2, sitting idle for 4 layers of the outside to be printed, modified in Excell, interesting.

Still can't see  why my profile is not the answer.  For a body wall scale the surface in one (X) direction.

Might help....

[etfrench]

Doesn't Slic3r already do this automatically?

[Anonymous]

Hi,

Slicers accept 2 or more nozzles to switch different colors or materials during the print, but always presume they all have the same diameter and have to print at the same layer hight 

I did'nt found any option therefor in the setup.

[Anonymous]

Hi,

the scale function dont makes the expected job, as it also would unevenly affect the shell thickness of complex bodys...

It would only function for elementary symetrical shapes as cylinders, cubes, spheres ... using ratio (x,y or z)Size / ((x,y or z)Size+2*ShellThickness).

Best regards, Alain.

[Anonymous]

Hi,

I think you'r right, but still hope a simpler way exist !

Best regards, Alain.

[chrisplyler]

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@wmhazzard wrote:

How do you know what they would or wouldn't ask? They said their model was more complicated than the sample so how complicated is anyone's guess. I know that AD wouldn't have an option in shell do do what the OP wants because you could get a zero thickness. 

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Well, of course I don't KNOW they wouldn't ask. I assumed they had a smidgen of common sense with regard to geometry.

1. You can't have a constant wall thickness in a single vector direction...

2. ...if the curve/shape of that wall approaches parallel to that desired vector direction at any point, because...

3. ...the actual wall thickness in a direction normal to the surface would approach zero, and you wouldn't have a wall at all.

So asking how you can achieve #1, if your geometry is #2, would obviously result in #3, making it a ridiculous question.

[etfrench]

Did you not read the link?

"A printer with more than one extruder can be used in different ways. If you have a multi-part model, that defines distinct regions, you can assign each one of them to an extruder. If you have a single part model, you can assign different roles to each extruder: for example, you can infill using a larger nozzle or you can build support material with soluble filament."

[wmhazzard]

"So asking how you can achieve #1, if your geometry is #2, would obviously result in #3, making it a ridiculous question."

So, no one has ever asked a ridiculous question before? You seem to like making ridiculous statements so why not questions?

[Anonymous]

Hi,

Sorry, but actually, I did'nt see slic3r was a link ...
Reading the topic, I noticed :

(... you can assign different roles to each extruder: for example, you can infill using a larger nozzle...)

Yes, different widhts but at same layer hight, except mistake ?

It's then more fast and easy to print the hole object with a 0.8mm nozzle at 0.1mm layer hight...

(...Slic3r has the feature to combine multiple STL files into a multi-material AMF file.

Split the original design into the separate parts within the CAD program, and export each part as STL...)

Of course, and it's just what I am asking the community for :  a way to correctly shell my object !

The shell would be exported as first stl file, (object minus shell) result as second one ...

Best regards, Alain.

[etfrench]

Not quite.  You can select which layer to print the infill.  There is no need to export separate stls, just set the larger extruder to print the infill and the smaller to print the perimeters.

I also think the current shell command with its constant width is actually what you need.   Offsetting the perimeters horizontally can/will result in thin areas, especially as the angle of the side approaches 0 degrees.