Creating 3d lines

Two approaches:

3D effect, but you can only do straight straws:

Left: artwork to be mappend onto the straw

Second approach is a blend.

Left: base artwork. There are at least two of them, both have a transform effect applied.

And then you need a curved path to use as the blend spine. And then you blend the round things along the spine

If you want shading, you need to create shapes to shade the "tube"

You can use the 3D tools in AI. Create a line in the shape that you want the straw to be bent. This is from memory as I’m not in front of Illustrator but here goes!  Then go to Effects > 3D Extrude and Bevel and select the Revolve function to create rotation around the profile. Alternatively, you can create a circle and then extrude it to create a pipe, there are a few options. Here’s a tutorial that might help you.

I’d recommend checking out Cineware for Illustrator. It’s a free plugin for Illustrator that allows you to import real 3D models. If you have an Adobe subscription then you will have a copy of Cinema 4D Lite (via After Effects). In here you have true 3D tools so you can make anything. There’s also a load of free content in there, including a drink with a straw!

Cineware for Illustrator - MAXON | 3D FOR THE REAL WORLD