One of the oldest methods of cleaning oil is a process called skimming, which is also one of the more reliable methods. The problem is that calm waters are required, or any skimmed oil can simply be released back into the water after a few big waves hit. But a group of researchers in China have developed a 3D printable oil-skimmer that was designed to be inexpensive, versatile and resistant to rough waters. The simply skimming devices can be 3D printed in the field and customized based on need, the type of oil that needs to be skimmed, and the amount of oil that needs to be collected. You can read more at 3DPrint.com: https://3dprint.com/132791/3d-printed-oil-skimmer/