From eXtrudy:

eXtrudy helps users to create simple, printable 3D objects like coins, medals, pendants. from photos or drawings. Unlike the common 2D-to-3D web applications it provides individual shapes, two sided objects, multiple decoration elements (engravings), hooks, volume calculation, .obj and .stl file export and a lot more. For simple tasks eXtrudy is much faster than complex modeling software. It is free, easy to use and you don’t need any knowledge about 3d modeling. All results could be uploaded to your 3d printing service without further corrections/modifications. Several tutorials are available on youtube.
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