OTTOsonics is a collective project by sound artists, developers, scholars and sound engineers working on accessible audio technologies for immersive sound production. Putting the focus on the needs of artists as well as non-specialized cultural and educational institutions, our objective is facilitating the use of immersive audio. In this workshop we will introduce and discuss our methods towards designing, building and maintaining an accessible high-density array of 3D-printed loudspeakers (100 speakers or more).