If you are a print on demand artist or graphic design artist, Vexels is for you. I use Vexels for t-shirts, mugs, apparel and high-end poster prints. Vexels recently updated their website: the interface looks great. In this video, I do a quick walkthrough of the new interface and show off some great features.
Link (including DISCOUNT!)
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03:04 PSD T-Shirts
03:42 T-Shirt Maker
04:51 Mockup Generator