<![CDATA[Natural fiber–based composites are increasingly investigated as environmentally friendly alternative materials. Bamboo fiber is known for its favorable stress distribution due to its natural structure, while cotton fiber contributes to improved stiffness and fiber–matrix bonding. This study aims to evaluate the effect of volume fraction and the combination ratio of bamboo–cotton fibers on the compressive strength of composites. The fiber volume fractions used were 30%, 40%, 50%, and 60%, with combination ratios of 1:1, 1:2, and 2:1. Fabrication was carried out using the vacuum bag method to enhance homogeneity and minimize voids. Compressive testing was conducted according to ASTM D695 standards. The results indicate that increasing fiber volume fraction contributes to higher compressive strength, with a maximum value of 12.8578 MPa at a resin volume fraction of 50% and a bamboo-to-cotton ratio of 1:2. Bamboo fibers provided a dominant contribution to compressive strength, while cotton fibers enhanced stiffness and improved matrix bonding quality.]]>
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