KORUZA innovates the design of a free-space optical communication system reusing mass produced Small Form-factor Pluggable (SFP) electro-optical transceivers, combining the latest advances in low-cost 3D printing using the Fused Deposition Modelling (F DM) method with bare-minimum custom electronics design. DIY friendly open-source release together with a complete kit of assembly parts as well as detailed instructions on how to properly assemble and test the system, is released. You can preorder kit at our partner company Fabrikor. KORUZA is fully documented on GitHub, using best practices of software design to allow collaborative editing. Primarily designed for urban environments, where Wi-Fi networks suffer from RF spectrum congestion and deploying wired is extremely expensive. KORUZA is resilient to these problems as its light beam is highly collimated, thus numerous units can coexist in a dense urban area, where the demand for capacity is high and distances are relatively short.