Printful

Printful connects e-commerce sellers to a global production network, handling everything from design upload to on-demand printing and shipping. You integrate directly with Shopify, Etsy, or your own store, and Printful manages fulfillment end-to-end. Their API is solid and integrations are straightforward.

With production facilities in the US, Europe, and Mexico, it's built to scale. You avoid inventory costs entirely, and their brand quality and turnaround times are reliable for sellers looking to grow their apparel business without upfront investment.