Flex filament is our own, unique PLA-mix filament with flexible characteristics. We developed this hybrid filament because it has the flexibility of TPC but without the printing issues associated with elasticity. This means that the user has better control over the stiffness of the final print; flex is very flexible and strong for low density, thin walled objects, and becomes much stiffer once the density increases. The softness and fast temperature transition in the hot end make flex a very pleasant and easy material to work with. The material has better layer bonding and bed adhesion than almost any other material.