A flexible insert is assembled using easily available porous plate and flexible polymer film. Then, applying microinjection compression molding technology, a fast and efficient method is proposed for successive, mass and one-step replication of polymer microlens arrays (MLAs). Orderly MLAs with convex microlenses are successfully prepared without a given micro-feature on the insert corresponding to that on the MLAs. Interestingly, the flexible films are deformed to arc-like profiles that match with the shape of the microlenses with different curvatures under the action of different mold compression forces. Hence, by only changing the compression force, a series of high quality MLAs with tunable height and so geometrical-morphology are molded by one flexible insert. The molded MLAs exhibit average heights of 61.61-86.28 mu m by varying the compression force from 90 to 120 kN. The molded MLAs exhibit favorable geometrical-morphology uniformity and optical properties. The proposed method is an accessible approach to avoid expensive equipment and complicated procedure for manufacturing the mold microfeature. POLYM. ENG. SCI., 58:213-219, 2018. (c) 2017 Society of Plastics Engineers