This pattern was designed for a school club activity but I figured I might as well post it so anyone who wanted to try to make it could!

Each ball of the molecule is knitted separately with straight needles then stitched together. You will need two balls of scrap yarn, one for the oxygen atom and one for the hydrogen atoms. You will also need some scrap black and white yarn for the embroidery, as well as a yarn needle.

The finished molecule should be around 6cm tall and 9cm wide, though size will vary depending on needle size and yarn choice.

The pattern is written to make keychains, but they work fine as plushies by themselves as well. You will simply skip the steps relating to attaching the keychain.