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f3d to STEP defective outcome

schmutzer2
Explorer Explorer
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Message 1 of 7

f3d to STEP defective outcome

schmutzer2
Explorer
Explorer

Hello to everyone,

 

The export of a f3D part to stp format produces an outcome with some broken fillets. These, as visible on a closer inspection, seem to produce defects in the cylindrical main surface as well.

It's the first time I export to stp. I don't know if this is a normal thing to happen, or if there are ways to prepare models before export that produce better results.

Maybe one has to model with export in mind? I mean, for example in the case of fillets, if it is better to model them separately like one would do with software like Rhino, while working with NURBS, instead of using the "magical" fillet tool in Fusion 360, which solves some fillet crossings with "star shaped" surfaces.

These fillet connections seem to be the ones which do not quite enjoy translation to stp.

 

I've attached 2 files:

Original.f3d was generated from scratch in Fusion. There are some yellow warnings, which I guess are there because it's part of a bigger design.

f3d to stp errors.f3d is the outcome from Fusion 360 export dialogue. That file includes a selection set to locate the damaged surfaces.

 

Thank you very much for your help!

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Replies (6)
Message 2 of 7

TheCADWhisperer
Consultant
Consultant

@schmutzer2 wrote:

I don't know if this is a normal thing to happen, or if there are ways to prepare models before export that produce better results.

There are some yellow warnings, which I guess are there because it's part of a bigger design.


It is not a normal thing to happen.

I prefer to model without unresolved issues.

If I do a Ctrl b (Cmd b) I get quite a list of unresolved issues.

 

If I Export as STEP and open in other CAD programs - errors in geometry are indicated.

Find Errors.png

 

I recommend starting over.

Fortunately this is a relatively simple part.

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Message 3 of 7

schmutzer2
Explorer
Explorer

Hello,

I really do appreciate your help and time you dedicated. It's great to receive good advice from experienced users like you.

Regarding the warnings on the part in the original.f3d from yesterday, I suppose it was because I "Saved As" the component to a new file and didn't stop the recording of history, inside that new one. I still make mistakes when extracting parts of a larger design from Fusion.

That component in the file I attached yesterday is part of a design with other parts and the relationships are lost in the "Saved As" file, because the related parts are absent. Inside the complete design file there are no warnings, ...fortunately..

 

Reviewing the part today to find a working solution, I've rebuilt the fillets in Fusion 360 from the original file, in what I would call a "more conventional" way, like one might do in programs like Alias or Rhino. Curiously, this way the f3d exported to STEP, has no issues when uploaded back to Fusion 360.

 

As an unexperienced user of Fusion 360, I might have made the mistake to use this fantastic fillet tool in Fusion 360  to make all the fillets in one shot because it can. That is an enormous relief, compared to having to fillet every single edge. But the "star shaped" fillet crossing resulting in this way, might be prone to produce more defects in STEP exported files?

In any case, I suppose it's probably always worth trying the one shot option, check the exported result and model the failing parts in a "safer" way.

 

Just to show what I mean, I've attached that file with a selection set of that parts.

I imagine it probably will be obvious for experienced modellers.

 

Thanks again!

 

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Message 4 of 7

TheCADWhisperer
Consultant
Consultant
Accepted solution

I am sure Autodesk would be very interested if this issue could be reproduced in a clean file.

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Message 5 of 7

schmutzer2
Explorer
Explorer

Hello,

Thanks for your reply again.

Maybe I'll try to make a clean example for Autodesk.

 

Have a nice weekend

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Message 6 of 7

g-andresen
Consultant
Consultant

Hi,

Especially for beginners it is a bad idea to switch off the construction history.
You lose not only the ability to make subsequent changes to features, but also the benefits of parametric design.

 

günther

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Message 7 of 7

schmutzer2
Explorer
Explorer

Hello Günther,

 

Thank you very much for your advice. I'l keep that in mind.

It is always helpful to receive constructive input from experienced users, especially in this stage when lerning "good habits" is very important.

 

I wish you a good weekend!

 

 

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