topic Re: Are Dynamic Fillets Possible? in Fusion Design, Validate & Document Forum

Are Dynamic Fillets Possible?

oo7_golden_1 — Fri, 10 Jul 2026 21:08:24 GMT

I am trying to start building my models to be as flexible as possible... Usually I can fiddle around with something until I figure out how to do it but I have been trying to figure out how to create a dynamic fillet and cannot seem to figure out how to do it.
So I have come to the masters. 🙂
I basically want a simple fillet to extend to a specific wall and I want to be able to adjust user parameters later and have that fillet adjust to always go up to that wall dynamically.
Is this possible? If so, what is the cleanest way to do this? I need to do it on 8 different sections so the cleaner the better.
If any wise Fusion users have any tips please let me know.

Re: Are Dynamic Fillets Possible?

TheCADWhisperer — Fri, 10 Jul 2026 23:55:33 GMT

@oo7_golden_1

Easy to do as long as edits don't break the logic.

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

Re: Are Dynamic Fillets Possible?

oo7_golden_1 — Sat, 11 Jul 2026 07:38:54 GMT

Ok, after sleeping on it I woke up and figured "Heck, you have it all setup as user parameters. Just input an equation that will solve the length of the side that will get adjusted during edits and use that as the fillets value." Which worked and was easy to do. Turns out I just needed some sleep.
BUT I would like to know if there is a cleaner better way to accomplish this. Is there a way to link the fillet value to the length of the lip so that if that lip gets adjusted later it will automatically adjust the value of the fillet to be the length of the new lip? Is there a way to do this using objects as opposed to user parameters?
I whipped up a simpler model to be able to use as an example. I included what I ended up doing on one of the sides (with user parameters). I would like to think there is a cleaner less complicated way though.
Thank you for your help and advice.

Re: Are Dynamic Fillets Possible?

TrippyLighting — Sat, 11 Jul 2026 20:28:55 GMT

@oo7_golden_1 wrote:

..I would like to think there is a cleaner less complicated way though.
Thank you for your help and advice.

I checked your file, and that is exactly how I would have done it. Perfectly clean and robust!

There are certainly other ways to achieve that, e.g., putting a fillet into a sketch with proper constraints and then extrude / cut.

Re: Are Dynamic Fillets Possible?

SaeedHamza — Sun, 12 Jul 2026 15:27:36 GMT

Actually the cleanest way to do this is to use a derived sketch dimension.

Do it like this:

1- Create a new sketch then create a dimension on the edge.

2- Create a fillet and use that dimension as the input radius of the fillet.

Attached you'll find an example that you can check out.

(view in My Videos)

Re: Are Dynamic Fillets Possible?

johnsonshiue — Tue, 14 Jul 2026 20:06:34 GMT

Hi! There are multiple ways to do this. Here is a solution without linking parameters. Basically, you need to turn the two short walls into separate solid bodies. Mirror the body and use Full Round Fillet to ensure the edges are rounded. Lastly cut the bodies and combine them back to the main body. It is a bit involved but highly doable.

Many thanks!

Re: Are Dynamic Fillets Possible?

TrippyLighting — Wed, 15 Jul 2026 11:28:27 GMT

Here is yet another way of doing this.

One more sketch.

One extrusion.

One mirror feature.

Re: Are Dynamic Fillets Possible?

pkomatlapalli — Fri, 17 Jul 2026 14:03:57 GMT

Hi @oo7_golden_1,

Good day!

We would like to check back on this issue. You have received lot of responses for your post from these community members TrippyLighting , Johnsonshiue and SaeedHamza . Does any of these responses helped resolved your issue.

If yes, please click on the "Accepted Solution" button, It would be very helpful for others who may encounter the same issue in the future.

Thank you!

Re: Are Dynamic Fillets Possible?

oo7_golden_1 — Sat, 25 Jul 2026 11:21:43 GMT

Thank you @SaeedHamza for your post. I had to watch it a few times to see how you went about building things. Thank you for taking the time to post a video.

Re: Are Dynamic Fillets Possible?

oo7_golden_1 — Sat, 25 Jul 2026 11:42:45 GMT

Wow. Thank you @johnsonshiue. I would never have thought to build it like that. Finding a means to use no parameters is exactly what I was interested in. Very creative.
Thank you for uploading a model as well. Being able to dissect and analyze each change you made within the models history was very useful and instructive.
I have not played with the "Boundary Fill" feature yet either, so you actually taught me a few things within your answer.
Thank you again.

Re: Are Dynamic Fillets Possible?

oo7_golden_1 — Sat, 25 Jul 2026 12:16:54 GMT

Thank you @TrippyLighting for posting another suggestion. This would likely be the solution I would use if I did not have my pre-built user parameters to work with.
A quick and fairly clean solution. Thank you.

Re: Are Dynamic Fillets Possible?

oo7_golden_1 — Sat, 25 Jul 2026 12:32:45 GMT

Sorry @pkomatlapalli, for the delayed responses. It took me a longer time than I intended to come back and review all of the great advice from our community members.
It would appear that a moderator has already marked them as "Accepted solutions" on my behalf.
Thank you everyone, for posting your advice and sharing your knowledge with the community. Seeing all of the unique and creative ways that different people can approach the same task in order to solve it is what makes humanity such a diverse and wonderfully beautiful thing.
I appreciate the work and service that you all do. Thank you.