For easy element dust put a male a female gacha (not neutered or spayed) next to each other and a snow owl in front of each gacha and only have them make element dust. Forcefeed owls stimmberrys to have them regurgitate more owl pellets. Works on official and single player. Got the idea from Syntac but he used one snow owl and didn't have the gachas make certain items.
Gachas are essentially living lootboxes and resource farms. They will eat anything (including stone, wood, or fiber) and turb it into crystals which can drop a variety of resources including black Pearl's, organic polymer, or obsidian, among other things. They also have a rare chance to drop higher-tier crystals which turn into upgraded armor and tools