Spreadshop makes it painless to upload your designs and create, sell, and ship a line of your own merchandise. Whilte this service is new, it’s powered by Spreadshirt, which has very successfully been doing on demand custom printing for almost 20 years. There’s one conspicuous feature missing, but the interface is one of the best we’ve seen, and several other features and perks round out a list of reasons for overlooking its single flaw.