There are some 3D printing applications for which nothing else will do but a flexible, elastic filament. German RepRap says their latest, TPU 93, is ideal for creating those sorts of functional parts quickly and inexpensively. TPU 93 filament is a translucent, thermoplastic polyurethane ideal for products such as cable sheathing, coatings for “soft-touch” surfaces and even medical applications. You can read the whole story here: http://3dprint.com/77924/tpu-93-flexible-filament/

Let us know if you have tried this new filament from German RepRap. Below is a picture of the material: