<p>In situ bioprinting, which uses the body as a bioreactor, May be more advantageous than conventional in vitro bioprinting, particularly when new tissues need to be made directly on the desired anatomical region inside a Living creature. Despite the Limited efforts to create in situ tissues that can be safely halted and stabilized during printing in live animal models, substantial progress is necessary to generate complex tissues on-site. Advancing tissue engineering through multidisciplinary study could lead to these changes in the future. Handheld 3D bioprinters May resolve numerous challenges associated with conventional bioprinters. Research suggests that this method May be effective in the regeneration of cartilage tissue. The purpose of this research is to examine the benefits and drawbacks of using portable bioprinters for in situ 3D printing of cartilage engineering Materials. Lay Summary. Handheld 4D bioprinting could revolutionize cartilage repair by enabling doctors to directly print living cells and biomaterials into damaged joints, offering a less invasive alternative to traditional surgeries. This portable technology promises faster recovery and improved tissue regeneration, though challenges remain in optimizing bioinks, ensuring long-term safety, and refining precision for complex cartilage shapes. Future work should focus on integrating smart, stimuli-responsive materials (4D bioprinting) and fostering collaboration across engineering, biology, and medicine to translate this innovative approach into clinical practice.</p>