The primary difference between promade and premade fans lies in how they are created. Promade fans are handcrafted by lash artists, offering a unique, luxurious effect to volume lash sets. In contrast, premade fans are a product that has been mass-produced and not individually tailored, making them less bespoke compared to the custom-crafted elegance of promade fans. This handcrafted aspect of promade fans enhances the overall aesthetic and quality of volume lash applications.