The integration of biomaterials into additive manufacturing (AM) offers a promising approach to sustainable construction; however, their evaluation remains fragmented and methodologically inconsistent. This study presents a meta-analysis of scientific literature published between 2020 and 2025, aiming to identify viable biomaterials for 3D printing in terms of mechanical performance, environmental impact, and economic feasibility. A hybrid multi-criteria decision-making (MCDM) framework, combining Fuzzy Analytic Hierarchy Process (Fuzzy AHP), COPRAS, and VIKOR, was applied to assess and rank six alternative materials, including mycelium, clay-based composites, geopolymers, and biochar-enhanced mixes. Quantitative data on compressive strength, CO2 emissions, and unit cost were extracted and normalized to enable cross-comparison. Results showed substantial variation in material rankings across individual methods, highlighting the sensitivity of outcomes to the evaluation approach. To address this, a Borda Count aggregation was employed, revealing geopolymers and biochar-based composites as top-performing alternatives overall. Among bio-based materials, lime-sisal fiber and mycelium demonstrated moderate performance with relatively consistent rankings. This multi-criteria evaluation provides a structured framework for material selection in AM, supporting informed decision-making for the development of resilient and low-carbon construction solutions.