One of the reasons why many of the experts consider rapid prototyping as the best possible choice is that there are numerous complex items in the world. These complex shapes can be best prototyped with some tools like the rapid prototyping only that uses the addictive method and not the traditional subtractive methods.

In the commercial world to day almost all the consumer products right from the detergent and shampoo bottles to larger items would be quite difficult to machine with the subtractive methods. The machining will be difficult even with inexpensive plastic prototype items. On the other hand the human anatomy is one of the most complex patterns with curves that are difficult to represent with machines due to their odd sizes.

You will also face the problem in respect of most of the sculptural products. Jewelries are also taking a complex pattern in the modern era. For any of these complexities you may find the traditional subtractive methods often wanting. Drawing the line beforehand is also difficult as the end results are not obvious always. However, the rapid prototyping remains the favorite because you can cover both simple and complex designs with it where as the subtractive method can only take care of the simple patterns and not the other way round.

Therefore, when your choice is to Upload your STL file today and receive your part tomorrow for any of the complex designs, rapid prototyping remains the best choice for you.