If you're looking for a service to create custom sneaker designs with AI, Imajinn could be a good choice. The service lets you quickly create custom sneaker designs with AI. Although it doesn't mention manufacturing, it's got a lot of features that could be expanded to include actual products.
Another service to check out is Resleeve. The end-to-end AI-powered fashion design service can turn sketches into high-quality photos and create an endless number of variations, which could be useful for creating a lot of sneaker designs. It's geared more toward the design process, but its abilities could be adapted to sneaker designs.
If you're interested in AI-generated clothing designs more broadly, Artificial Printer lets you create custom clothing like t-shirts and hoodies with large AI models. It's geared more toward other types of clothing, but its technology could be expanded to include sneaker designs.