For those of us that do not have a 3D printer there is another older technology that is less expensive and will work. To use this technology one must have a sample part, borrow a sample part or carve a sample. This process involves making a rubber mold and casting a fast curing plastic into the mold. When the plastic is cured it can be easily removed from the mold. Because of the nature of the part, an open face mold will work well. One may need to try different plastics to find a composition that has just a little flexibility so that it does not break when stretched or flexed. Many art stores sell rubber mold making kits and also the plastic to cast into the rubber mold. Just a thought.