Digital amputation, frequently encountered in industrial settings, results in functional and psychological challenges for affected individuals. Surgical restoration or prosthetic solutions are commonly sought for amputation recovery, with many opting for passive prostheses to restore the cosmetic appearance of the amputated hand. Unfortunately, existing prosthetic options often face abandonment due to issues such as excessive weight, limited functionality, and obtrusive structures. This paper presents a novel approach to address these challenges through the design of partial finger prosthetics utilizing a set of slider-crank-based linkage mechanisms. The proposed design incorporates two serial slider-crank mechanisms and a crank, offering a lightweight and unobtrusive appearance. By leveraging the flexion movement of the remnant finger stump, this design translates the motion to the partial finger prosthetic, achieving flexion motions akin to the interphalangeal motion of the human finger. The paper outlines the geometrical considerations and structural design of the proposed prosthetic, emphasizing the optimization of crank and connecting rod lengths for mimicking natural finger flexion. Additionally, the fabrication process of prototypes using 3D printing technology is discussed. This innovative approach aims to provide an effective and aesthetically pleasing solution for individuals undergoing digital amputation.