Printful: Print on Demand

It's been about three years since I used Printful as a print-on-demand provider, and I simply love the quality of their products (so do my clients).
The support service was efficient when one of my orders had delivery issues, when I had questions about products, or when I needed to update data. The integration to Shopify makes it super easy to use. Setting up the store and products is super easy. Creating multiple versions of one product is fairly simple (though I wish there was a tool that saved me more time on this one).