After watching Devin Montes's great video about his "Triangle Mesh Fabric" and despite the facts that I don't have a lot of experience with 3D modeling software, I also gave it a try and had a lot of fun experimenting with different forms and shapes.
This was my first and most basic design, it's basically just a few interlocking squares and H - shaped objects.
I recommend printing this model in PLA and without supports.
The distance between the parts is quite big, so this should be easily printable even without a part cooling fan.
The files include all 4 basic shapes to create custom shapes and sizes, as well as two example squares. Multiple can be connected by using a 3D pen.