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We present OpenFPM, a modular, low-cost, and open-source FPM platform in which conventional and optomechanical hardware is replaced with compact, low-cost three-dimensional-printed components. Illumination, sample and objective positioning, and camera triggering are controlled using a Python-based interface on a Raspberry Pi microcomputer. With a 10\u00d7\/0.25 NA objective lens and 636\u2005nm illumination, OpenFPM experimentally achieves amplitude and phase reconstructions with an effective synthetic NA of 0.90 over a 1\u2005mm field-of-view. 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