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This paper presents the design and performance of an easily scalable Theta/Phi fiber positioner for multi-object spectrographs (which has been developed by Ecole Polytechnique Fédérale de Lausanne (EPFL) together with the Swiss manufacturer of miniature microsystems MPS). The positioner has been designed with the purpose of adapting readily to the requirements of any multi-object spectrograph, which requires precise positioning of optical fibers. Whether MOONS, PFS, MEGARA or DESI, each project has so far developed its own fiber positioner from scratch, with all of the risks linked to such a complete new development. The positioner presented in the current paper intends to significantly reduce the development time, costs and eliminate unforeseen risks. The design will be detailed and highlighted to be easily scalable in size, length and shape. We will expose in which range the main geometrical parameters can be changed within the limits of the technology. Finally, we will discuss how the experience made with four different projects have led to the design of this positioner platform as well as results of performance testing on a set of prototypes with 9mm external diameter.
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