This document provides instructions for building a basic prosthetic leg model using common household items. The materials needed include a paper towel roll, duct tape, rulers, a lint roller, sponge, bolts, nuts, an optional ace bandage, scissors, and a nail. The 5 steps describe how to attach the rulers and sponge to the lint roller to form the leg structure, puncture the paper towel roll and attach it, cut a notch for joint movement, insert a PVC pipe for stability, and finish by adding a sponge, ace bandage, and shoe.