3D Printing is becoming a common method for producing parts and toys by small independent creators all over the world. These people often maintain several printers in their home or shop in order to make the products that they have created.
But if you are just starting out or trying to grow, the time and expense of your own personal 3D printers can make them prohibitive. Personal printers often cost $500-$3000 which, for a small cottage business is a high startup cost.
But with production 3D printing you can just upload you models and have your manufacturer hold them in digital inventory. That is, there is a onetime preparation fee, and then the part is ready to be printed forever. When an order comes in it is pushed to the manufacturer who will access the digital file and print the design.
And since companies like Slant 3D support dropshipping you can enter into a monthly plan where you pay a flat fee for each shipment and have Slant 3D print and ship the part only when it is ordered. This means you can create a business for basically zero upfront cost, and only pay the cost of manufacturing on a per-part basis. It is a lot like posting an app to the Appstore. You just create a digital design and it is copied when the design is ordered.
An Alternative method to operating on a small scale is to order inventory in small quantities for you to hold and then ship, like a traditional retailer. Again the design would be held in "digital inventory" by Slant 3D, and when you need 10-100 pieces for your stock you just send a message and the pieces will be printed and shipped to you within a few days.
And whenever you want to grow you business or add new products, you basically just send an e-mail. No more affording, maintaining, and operating your own printers. Just design great products without having to pay for them until they sell.