The past decade spotlighted a trend, which is that of individual users taking the role of innovators and physically creating their own products by explooting model additive manufacturing techniques. This trend emphasized the need for facilities able to serve as a platform for passionate makers to share knowledge, meet others and provides opportunities to realize their ideas. One of these platforms is Karlskrona Makerspace (KMS). KMS is located at Blekinge Institute of Technology (BTH) and provides 3D printing service, CNC milling machine and other facilities to help companies and individuals build physical prototypes. The purpose of this thesis is to expand the business of KMS and offer their service to more people. The study collects customer needs from potential KMS customers and aims at obtaining a viable business model after ranking risks. The main methodology used for building a business model is Running Lean Methodology to clear up complex associations in a business. The result shows that the business model identifies target customers, and clarifies the solutions to increase funding for KMS.