Infill percentage explained: when more plastic is not stronger

By Let's 3D Studio · 1 min read

Infill controls the internal structure of a print, but it is not the only route to a stronger part. Walls, top and bottom layers, material choice, nozzle width, and print orientation often have a larger effect on how a part behaves in use.

Start with the job. Decorative objects can use modest infill, while a bracket or enclosure may need more walls and a pattern that supports the expected load. A functional part should be tested under realistic force rather than judged only by how solid it feels in the hand.

Increase infill deliberately, because very dense prints add time, material, and heat without always solving the weak point. If failure occurs along layer lines, changing orientation or material may be more effective than filling every internal space.