This problem is even worse with PCL, which is so viscous it's almost unusable for most purposes. Thinking about PCL fibers in https://news.ycombinator.com/item?id=16380491, it occurred to me that I had made some crude PCL fibers by hand — while the plastic wasn't molten. So it occurred to me that you could probably make PCL fibers by the process of die drawing, the same way you make copper fibers or steel fibers, maybe without even the annealing steps in the middle. Presumably this would work for a variety of plastics with high elongation at break.