Check out below the list of items along with needed materials that can be crafted to level Synthweaving the cheapest way.
Each item will give you 2 skill points (when crafted in the specified skill range). This list is mostly useful for max level chars that want to reach 400 Synthweaving quickly. If you are still in the process of leveling your character along with your skills, you’ll most likely craft items that you'll use, which are in some cases, different than the ones on the list.
It is not recommended to acquire all the materials from the beginning as you'll get a portion back through Reverse Engineering and reuse them to further increase your skill.