How thin is to thin?

When designing and manufacturing using CAD/CAM technology there are certain limitations you have to adhere to. One major limitation being metal thicknesses. The minimum metal thickness for you to have a successful print/ cast is ;

Wire work : 0.6mm
Metal Thickness : 0.55mm (although it is not always successful)

However everything is dependent on volume due to casting and the metal being able to flow...

Example:

Even though the image above has a metal thickness of 0.3mm at the top; it will still be a successful print/cast due to the article having volume....