The Miller is a part of your colony’s production line. The Miller can learn 3x3 recipes made of at least 75% wood that do not include ingots, stone, redstone, or string. The Miller will also craft a few other items, including cactus planks, shingles, timber frames, and barrels. The Miller will only make these items when they have been taught the recipes, receive a request for an item, and have the needed materials.
Note: The Miller can only learn a set number of recipes based on their hut level. So: