A 3D printer based slot-die coater is developed as a lab-to-fab translation tool for solution-processed solar cells. The modified 3D printer is used to develop the printing process for potential use in large scale roll-to-roll production. Fabrication of a 47.3 cm2 organic solar cell module with 4.56% efficiency and printed perovskite solar cells with 11.6% efficiency are demonstrated. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

3D Printer Based Slot‐Die Coater as a Lab‐to‐Fab Translation Tool for Solution‐Processed Solar Cells