As expected, it was tedious peeling away all the enclosed material a tiny bit at a time. Right at the start the little hook broke off the top, so I expected more breakage.
But the rest of the material peeled away without any further breakage.
The body of the spring proved to be surprisingly resilient. On close examination I could see lots of little loose ends. These are unsightly but they don't seem to weaken the spring.
Evidently this unexpected resiliency was imparted by the long overlap between layers. There's exactly 1 layer of red material in the model, but red band shows how that layer extends a long distance around the spring, thereby giving it ample distance to be bonded with the layers above and below.