3D curves

I can’t connect two 90-degree springs to create a 3D surface

Hello, for springs I can suggest you try connecting the face points using the Translate tool

can we swept the two lines together in a 90 degree context

How to use with sweep command

Hello, it will easier to understand what you will like to do if you attach an image sample of your design. Here’s our tutorial video on the Sweep Tool:

I hope this is helpful.