Glue

Glue can be used as an alternative to slimeballs in the crafting of a Wood Blade and Sticky Pistons

Crafting

Glue is made by cooking 8 bones, 16 feathers, or a piece of leather (plain, scoured, or tanned) in a cauldron heated by fire stoked by a Bellows. Each of these will create one unit of glue.

The cauldron only cares that there's enough Monster Material to make a single unit of glue - 8 bones or 16 feathers, or some combination that totals up to the same. All amounts of bones from 1 through to 7 work so long as two feathers for every missing bone is added.