Projection, unfortunately won’t produce the desired result - it will not “unfold” the material into a 2D that can be “folded” back to 3D. This is more of a “wrap” / “unwrap” procedure, that you’re looking, but it is missing in Shapr3d. I’m eager to have it too!
So, check around the forum if some specific technique for “unwrapping” can help you. Good luck!
UV unwrapping is rare with CAD software, because the models we make are triangulated. UV unwrapping is common when working with polygon models in 3D modelling and sculpting software.
That said, I’ve successfully converted lots of my Shapr3D projects to polygon models in the likes of ZBrush, Nomad Sculpt and Blender. It’s not always straightforward and can entail some reworking of parts.
Original Poster is using Sheet Metal feature to get 2D pattern I assume. If you show a visual example how you used 3d model to get a 2d textile pattern? Are you talking about repeating pattern, that be more of 2D creative interpretation of 3d model it can’t be folded back to create a 3d model.
If textile meaning clothing there are specific software for that as well.