Fluid cartridge with valve mechanism

A method of making an article comprising:

• (a) providing a body comprising a malleable and plastically deformable material and comprising:
• (i) a surface,
• (ii) one or more channels formed in the surface, and
• (iii) one or more valve bodies formed in the surface and in fluidic communication with the one or more channels, respectively, the one or more valve bodies comprising:
• (A) a segment of a respective channel of the one or more channels, the segment comprising a wall having a pair of ridges raised above the surface and a floor depressed into the surface;
• and
• (B) reliefs depressed into the surface and defining depressions that flank the ridges on two sides of the segment;
• (b) providing a layer comprising a deformable material;
• and
• (c) bonding the layer to the surface and the ridges, wherein bonding seals the one or more channels, the segment, and the reliefs.