Reading about stretchy circuit board development, it says that stretchiness is needed as well as thinness. I wonder if anyone has thought along the lines of a fibre mesh? (I’d guess so!) For instance, with paper mache, if you want to wrap around very smoothly, you use very small pieces of paper, and you expect the fibres on the torn edge to mesh with the layer underneath to make the curved surface smooth. Likewise with wool felting, the scales and crimps in the wool fibres engage through friction to make a mesh, which gives felt the ability to be stretched and molded. Maybe circuit board components could be made in a fibre form which would mesh in a similar way?