Taming an Achatina (the snail) is a good way to farm organic polymer since after taming it it will produce 100 cementing paste and 100 organic polymer after a certain amount of time(only after being set to wander). And for me it seems that they will be content to just eat out of a feeding trough instead of eating exclusively cakes so it is a good way to farm both items with relative ease. And you can store it into a kairuku or some other tame to store it before you start to craft something.
Dont eat it, tame a decent moschops and level it up, hold E and u can find harvesting levels and put all points on to organic polymer. Tame a couple (male and females) of penguins and make them breed and kill all the babies with the moschops.
This method is called converting. ( only casual) So their is organic polymer and normal polymer. (Organic is a substitute for normal polymer) now obviously you can get a lot from killing Kairukus or using a snail. But theirs a catch to using organic vs normal polymer, organic spoils and comes in stacks of 10, normal does not spoil and comes in stacks of 5000 (mobile). Fabricators can only hold 70 slots. Organic can not be used for advanced blueprints ( Mastercraft/ascendant) how the trick work is this. Get a pretty big that uses polymer. (Vault,air conditioner, or elevator things,) take out all normal polymer and keep organic. Make the structure and then destroy it the organic polymer comes back as normal polymer. Rinse and repeat as many times as you want. thank you for reading and respond me at @Blackout