How to approach this modeling exercise

[teddysalad]

Hi, I’m doing some modeling practice as a new Blender user, and I’m struggling with how to approach some parts of this sofa: https://www.ikea.com/us/en/p/froesloev-sofa-hyllie-dark-gray-40511532/

Specifically, I’m stuck on how to get the cylinder shapes around the seams of the cushions. I’ve been trying to model those as separate objects but I can’t get it quite right. I would share images or my blend file but it’s not letting me upload since I’m a newbie.

I guess I’m just looking for some tips and ideas on how anyone else would approach it. Thanks!

[LordoftheFleas]

Do you mean these shapes here?

I’d use a curve for those:

1. select the edges you want to convert, duplicate (shift-D) and separate them (P, selection)
   

   

2. right-click the new object and select convert to → curve
   

   

3. change the curve’s geometry settings:
   

   

4. if necessary, you can convert back to mesh, add caps, some edge loops and a sub-d modifier:
   

   
   
   
   

[teddysalad]

This is fantastic thank you so much

[Jeric_Synergy]

FWIW, such elements are called “piping”, both on furniture and clothing. I’m not sure if they serve a function or are just decorative.