The fusion of 3D and 4D printing is revolutionizing how bioimplants are developed, making it possible to create implants that perfectly match a patient’s anatomy. This personalized approach improves how well implants fit, boosts their performance, and reduces complications compared to the one-size-fits-all models traditionally used. With 3D bioprinting (3DBioPr), implants are built layer by layer from digital designs, allowing for an exact match to most complex body structures. Taking it further, 3DBioPr positions living cells and biomaterials to create scaffolds that mimic natural tissue. This makes implants more compatible with the body, encouraging better integration. Researchers are advancing the field with bioinks to enhance cell adhesion, growth, and tissue regeneration. But 4D bioprinting (4DBioPr) uses materials that can change shape or function in response to their stimuli; environment, like shifts in temperature, pH, or mechanical forces. This allows for smart implants that can adjust after being placed in the body. This chapter dives into how these technologies are advancing, focusing on how materials, patterns, and topography are used in bioprinting. It highlights the wide-ranging applications of 3DBioPr /4DBioPr in tissue engineering, including cartilage and heart tissue regeneration, as well as in orthopedics, neuroprosthetics, advanced wound care, and targeted drug delivery. The discussion wraps up by looking at the future of bioimplants, touching on the technical hurdles, regulatory demands, and ethical considerations that come with these innovations.