Poly is a multitool 3D printer that uses open source firmware and software, made in PLA, a totally ecological and compostable material. The concept behind Poly is based on three keywords: open-source, eco-friendly, and upcycling. Poly is equipped with a range of tools: an extruder nozzle, a laser engraving kit, and a chocolate extruding kit.
Buinding guide: https://www.instructables.com/id/Poly-3D-Printer/
RepRap Wiki: https://reprap.org/wiki/Poly