# Add feature Concave fillet **URL:** \ **Category:** Modeling Questions\ **Created:** [October 17, 2021, 11:53am UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397 "2021-10-17T11:53:58Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Arghus](https://avatars.discourse-cdn.com/v4/letter/a/b5ac83/32.png) [@Arghus](https://discourse.shapr3d.com/u/Arghus)\ **Post date:** [October 17, 2021, 11:53am UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/1 "2021-10-17T11:53:58Z")
I want a feature to be added, the ability to make Concave fillets with the “chamfer/fillet” tool. Instead of having to make a second cylinder, convex that cylinder and subtract the shape to make a Concave. Attached you can find illustrations of what I am talking about. ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/a/adfd2f0bd399e71f7b4bdf97df57f9bf850f8ed8.jpeg) Please add this and thank you. ---
**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\ **Post date:** [October 17, 2021, 5:19pm UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/2 "2021-10-17T17:19:23Z")
For these situations, I would draw the cross section (profile) of the bottom part, then revolve it. ---
**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\ **Post date:** [October 17, 2021, 8:06pm UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/3 "2021-10-17T20:06:32Z")
---
**Author:** ![Farley](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/farley/32/29763_2.png) [@Farley](https://discourse.shapr3d.com/u/Farley)\ **Post date:** [December 5, 2024, 9:05pm UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/4 "2024-12-05T21:05:44Z")
That only works for a simple circular shape. What about an irregular shape. Why can’t we have a concave fillet support? Seems really silly to not have this, I have to hack around this and do a normal fillet which I use as a subtractor to where I want my concave fillet. Please can we add this feature? ---
**Author:** ![ggltoddmiller](https://avatars.discourse-cdn.com/v4/letter/g/e9c0ed/32.png) [@ggltoddmiller](https://discourse.shapr3d.com/u/ggltoddmiller)\ **Post date:** [October 6, 2025, 1:44pm UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/5 "2025-10-06T13:44:58Z")
I agree. I’ve needed it a few times and have had to use sweeping as a workaround. ---
**Author:** ![Systox](https://avatars.discourse-cdn.com/v4/letter/s/7c8e57/32.png) [@Systox](https://discourse.shapr3d.com/u/Systox)\ **Post date:** [October 25, 2025, 7:49pm UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/6 "2025-10-25T19:49:26Z")
Would have been nice to have a concave fillet or reverse fillet feature just now. ---
**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\ **Post date:** [October 25, 2025, 10:27pm UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/7 "2025-10-25T22:27:11Z")
https://www.loom.com/embed/15e41dafc4304473a12a84c25d88ec12?from_recorder=1&focus_title=1 ---
**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\ **Post date:** [October 26, 2025, 12:15am UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/8 "2025-10-26T00:15:07Z")
In the interim, does this work for you? ---
**Author:** ![Systox](https://avatars.discourse-cdn.com/v4/letter/s/7c8e57/32.png) [@Systox](https://discourse.shapr3d.com/u/Systox)\ **Post date:** [October 26, 2025, 3:32am UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/9 "2025-10-26T03:32:25Z")
Uhhh, my bad, I think I was Imagining something a little different. like a subtractive process that scoops out material where the two edges meet making like a concave divot or trough… to avoid having to create another object to substract from where the two faces meet. Something like this: ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/5/a/5a703c7658278ef3f32a971406ea7e0f94b1565b.jpeg) Looks like a feature an app called plasticity has? [![](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/c/c/cce2dfc5c1d0463f754233b66852be2b8b4bb0de.jpeg "Plasticity | Create an Inverted Fillet") ](https://www.youtube.com/watch?v=kuyVbJgY1PA) ---
**Author:** ![SCALEMODEL](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@SCALEMODEL](https://discourse.shapr3d.com/u/SCALEMODEL)\ **Post date:** [October 26, 2025, 4:05am UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/10 "2025-10-26T04:05:20Z")
LOL i was quite confused! More like this. It’s called Pipe tool in Plasticity. ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/4/a/4a9bcb076ed5776207ffa188d53bb0f0c4125c8b.png) ---
**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\ **Post date:** [October 26, 2025, 4:07am UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/11 "2025-10-26T04:07:20Z")
Well, there are workarounds (for now anyway). ---
**Author:** ![Systox](https://avatars.discourse-cdn.com/v4/letter/s/7c8e57/32.png) [@Systox](https://discourse.shapr3d.com/u/Systox)\ **Post date:** [October 26, 2025, 3:04pm UTC](https://discourse.shapr3d.com/t/add-feature-concave-fillet/15397/12 "2025-10-26T15:04:24Z")
Appreciate everyone’s input 👍