To make a 3D model and its supports look durable, focus on structural reinforcement, strong materials, and post-processing that emphasize sturdiness.
Add thick edges, ribs, or gussets to stress points (like joints or bases) to boost visual and actual strength; choose high-strength materials such as PETG or nylon; sand support marks and use matte/textured paint to hide weaknesses and enhance robustness.
For functional parts (brackets, tools), reinforce load-bearing areas; for decorative models (props, statues), add stone- or metal-like textures to suggest durability.
Use dissolvable PVA supports to avoid surface damage, then seal with a clear coat to make the print look more solid.