The lifespan of a 3D printed model can be influenced by several factors, including the quality of materials used, environmental conditions, and whether protective measures have been applied. Typically, an unprotected model may start showing signs of aging and quality degradation within 3 to 5 years, especially if exposed to direct sunlight or fluctuating humidity.
Applying protective coatings such as varnish or paint can extend the model's lifespan by preventing color fading and material degradation. However, regular maintenance and periodic checks are still advisable to ensure the long-term preservation and display quality of the model.