Here is a 3D printable drain snake. This tool allows you to clean out all the gunk that gets stuck/caught in the drain. The whole idea is instead of spending a lot of money on a store bought drain snake, you can print this snake yourself for a few cents and then throw it away after you use it.
Let me know if you have any questions or tips. I also recomment to print it solid so it doesn't break in use. It's literally only a couple of grams of plastic so still cheap.
The author marked this model as their own original creation.