Purpose Complex surgical oncology demands meticulous preoperative planning, particularly in multi-specialty surgeries. Aligning surgical objectives, considering surgical intent, approach feasibility and trauma minimisation, is crucial. While MRI and CT are invaluable for planning, integrating the use of 3D modelling can enhance visualisation of patient-specific anatomy and pathology. Methodology Using an MRI scan of a 60-year-old man with advanced bladder cancer invading the rectum, a 3D model was generated using 3DSlicer software for segmentation and MeshLab for refinement. Structures, including the bladder, rectum and prostate, were manually contoured. The model was printed on a Bambu Lab A1 3D printer using PLA filament. Results The 3D model provided detailed spatial understanding of anatomical relationships, improving preoperative planning and intraoperative execution. The surgical procedure, including cystoprostatectomy and Hartmann’s procedure, was successful, with the 3D model providing guidance in the approach and enhancing collaboration among team members. Conclusion Beyond visualisation, the model optimised surgical strategy by aiding in precise tumour delineation and enhancing interdisciplinary communication. Its educational utility aided trainees and students in understanding pelvic anatomy and surgical techniques. Limitations included time-intensive manual segmentation and reliance on high-resolution imaging. Addressing these limitations and adopting cost-effective solutions could broaden 3D modelling adoption, particularly in regional centres. Future advancements, such as automated segmentation and augmented reality, could improve efficiency and enhance intraoperative applicability.