On ark mobile, if you are on casual difficulty you can use an achatina to get organic polymer by logging out then back in, then craft something with a fabricator with the organic polymer.(make sure you have enough of the other resources and make sure to make 2)Then place 1 then the other (i used elevator track), then get 1 of them back (there is a short time where you can pick up the structure without destroying it) then destroy the other one. You will get polymer instead of organic polymer. Rinse and repeat and you have virtually infinite polymer.