Flex duct convert from spline in 3D?

I try to find any plugin or lisp to make flex duct simply. Could anyone help me in this queston ?
I checked many website like ducting and forum to find one but there is 2D version mostly.

Hi @dvahshe , unfortunately, I think you’re asking in the wrong place, SimScale simulates mainly Fluid flows, Structural deformations and stresses and thermal characteristics of products. By the sounds of it, you want to take a tube-like product (ducting) and warp it to match a curvature of a 3D spline, which would be a bit overkill to do with Simulation. Maybe you should check out a 3D CAD package like OnShape?