Here are three examples to experiment with: 1. An action figure needs a sturdy arm. Use ABS or PLA for the body and FLEXY for the hand. You can then open the hand to have it hold things. 2. Make a container with ABS or PLA and make the lid with FLEXY so that it can be easily removed. 3. For any structure, make an ABS or PLA core, and then coat it in FLEXY so that you have a solid frame with a rubbery outside surface.