Help with Fillets

[Lx4lights5124]

I'm trying to recreate the object on the left which is a cut off piece of a larger object from an STL I'm trying to modify. The object on the right is as far as I've gotten. I'm now stuck on trying to figure out how to recreate the slot. 

All the fillets on the left object are the same except for the left side and top of the slot. I'm not quite sure how to recreate it. Maybe fillet is not the correct thing to use? Any tips would be appreciated. 

TIA

[Bunga777]

It would be good to use variable fillets.

The video is pasted here.

https://knowledge.autodesk.com/community/screencast/949fabbf-b468-483f-9a63-013f42975766

[Lx4lights5124]

Oh this is so close! Only thing is the curve on the left side is more gradual. The end points of the curve are not equidistant on the top and side faces. I'll attach my file maybe so you can see what I mean.

[Bunga777]

I see.

This looks like I will need to use loft.

I will try it later.

[Bunga777]

I did a little work on this during a break.

I took a section from the original model, wrote a spline along it and exprode the surface to create a face.

I didn't have time to take a video, so I am pasting the model.

Please refer to the model's history to see how to do it.

[laughingcreek]

looks like @Bunga777 and I took similar approaches, see attached.

[Bunga777]

@laughingcreek 

However, I am sorry to say that my data has resulted in a model where the fillet of R1 in the front part cannot be made well.

I think it is probably because the connection of the surfaces is not good, so it needs to be improved.

[laughingcreek]

@Bunga777 -the spline you used has a bunch of points, resulting in wonky curvature-

delete all the points except the 2 on the end and fix the curve up with the tangent handles-

after that you can put the fillet on the end.

[Bunga777]

@laughingcreek 

I was going to try again later too.

Thanks for confirming that for me!!! I appreciate it!