A Rapid Fit Modular Prosthetic Device that can be inexpensively manufactured using modern technology and advanced polymer materials. The Rapid Fit Modular Prosthetic Device will be immediately fit on the residual limb and aligned for optimal gait without specialized tools or labs, alleviating the many steps involved with conventional labor-intensive and costly prosthesis construction. The Rapid Fit Modular Prosthetic Device also accommodates the changing in size and shape of the limb, eliminating the need for multiple prostheses and adjustments to an existing prosthesis during the lifetime of an amputee.