Bulk cubes of metal, wood, glass, soil, and stone for real Minecrafting
I dunno why you need shapeways when you can order full-size materials in cube form from Alibaba, mostly minimum order ~10 tons:
Limestone cubes
Granite cubes (various colors)
Metal cubes (aluminium, brass, copper, iron, lead, and zinc)
Tantalum cubes (toxic?)
Wooden cubes
More wooden cubes
even food: