Shell Tool producing undesired shape after using Loft Tool

Hello!

I am trying to get into using shapr3d, and at this point in time, specificially trying to create an adapter to connect an air duct to my window!

A crucial part is the transition from a circle (the duct) to a rectangle, which is done via the Loft Tool.

However, when trying to use the Shell tool afterwards, it creates a weird curvature on the inside of the rectangular-end of the object, instead of two parallel lines.
I marked the two, at least to me, confusing lines in the following screenshot:

I would be glad if anyone could explain how this came to be!

Unfortunately, as I am a new User, it does not allow me to upload attachments just yet.

Kind regards

I’m no CAD programmer but I think that curvature is coming from very rounded bottom averaging to very straight top, plus trying to give consistent thickness, so either that or the SHELL will fail.

Another approach would utilizing sketch offset and just loft the offset/wall.

Since we now have offset constraints you can add variables so you can control thickness like shell.

Hello, I hope I understood you correctly!

Unfortunately, when trying to loft a Face that has a Hole, so “just the wall”, shapr3d throws an error.

The Documentation for the Loft tools states “Loft profiles can only be single closed cross-sections”. I’m not sure whether I am doing something wrong, or whether the Loft tool simply isn’t meant to create shapes with holes - but for now I will assume the latter.

Kind regards!

Adding guides will solve this problem. Make them 90 degree to the top to get straight lines.

Also you can apply negative shell to make straight lines inside of the top hole.

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I think that guide approach is best.

But if you were wondering about the loft it does not all need to be done all at once it can be divided (when you get an error), forgot to mention that one.

Since you are working with something symmetric other side can be mirrored.

Another thing I noticed before, if you loft all at once you sometimes get that bent edges too.