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From: corchet
my bad i forget the subtracted piece
From: Michael Gibson
Hi mk1978, it tends to be more difficult for the booleans to process objects that have overlapping surface areas, it makes for a more complex intersection.
It can work though if the pieces are accurately placed. In your your case here things are off by a bit:
Like corchet mentions above, it's also not so good to have large coordinate values for your objects like having it 10000 units across.
In the attached file, I scaled your objects down by 1/100 in size so they don't have overly large coordinate values and I also just moved your pieces so they were accurately in place and now the boolean should work ok.
- Michael
Attachments:
ExtrusionTest2_3dm.zip
Image Attachments:
mk_bool1.jpg
mk_bool2.jpg
mk_bool3.jpg
mk_bool4.jpg
From: mk1978
Thanks for the comments Michael. It seems that I have made small errors when editing/mirroring parts so it is good to understand that these are causing the problem. Naturally it is difficult to spot these because the model/parts are huge in size.
From: mk1978
Again I would like to ask some help in modeling approach. How would you model this kind of shape?
I would need to model a fan duct for a 3D printer and I would like to use this model as a basis. I need to remodel the fan to make it fit to my purposes but how could I create this kind of geometry? I have tried to take some basic planes from the original model and I have tried to use Loft + Shell functionality to create the shape but this doesn't create a solid model but it get splitted. Do you have any ideas how to model this kind of shape that hollow from inside?
I was also able to import the original model to Moi3D as a obj file but it seems really complicated to edit the obj imported model. This is the reason why I was planning to model it with the help of some basic planes from the original model.
Attachments:
ChironFan.3dm
Image Attachments:
Moi3D Model.JPG
Sketchup Model.JPG
From: bemfarmer
Short extruded, rectangles, or circles or ovals can be blended between. Select the edges to blend, not curves.
Delete or hide, the curves overlying the edges.
-Brian
The short extrusions can be temporary.
The blended sections can also be blended between.
Make some strategically placed cross sections...Small extrude, Blend, (delete unwanted extrusions), Blend remainder, repeat ...
From: Barry-H
Hi,
this may help.
1)Create temporary lines.
2)Blend between them.
3)Loft straight with close and planar to form solid.
4)Extrude Fan chamber.
5)Boolean union and add fillets if required.
6)Remove Entry and Exit faces.
7)Shell.
Cheers
Barry
.png)
Image Attachments:
Screenshot (437).png
From: mk1978
Thanks a lot for detailed instruction. I had not used Blend command earlier and I was not aware that you can use it also for lines. I am not sure how the Blend selects the position/direction of the blend but I finally got it working!
Loft was also giving me really weird results but I finally used Network + Shell commands I was able to create the needed shape.
From: Barry-H
Hi,
the blend works by which end of the line you click on when you select them.
The loft works in the order you pick the curves so that's probably the problem you experienced.
Anyway glad your sorted.
Barry
From: bemfarmer
Blend also works on edges. Note that cylinders do not have their ends, and there are no curves at the ends, just the edges.
https://moi3d.com/forum/index.php?webtag=MOI&msg=9222.5
-Brian
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