Design Nomenclature / Physical Model Making

Infill

Also called fill density, internal lattice, fill pattern

This entry has not been translated yet and is shown in English.

The sparse internal lattice printed inside a hollow shell, set as a percentage. Beyond roughly 40% it buys almost no strength — stiffness comes overwhelmingly from the perimeters, which sit furthest from the neutral axis. Raising infill is the most common wrong answer to a part that broke.

Section through a printed wall standing on the build plate, its courses drawn as horizontal layer lines. The interior carries a sparse zigzag lattice in accent, its struts meeting at shallow angles and leaving voids far larger than the material between them.

In practice

"Print it at 100%" is the reflex and it is nearly always wasted time. Add shells instead: two more perimeters beat forty more points of infill.

Not to be confused with

ShellThe solid outer walls of a print, counted in perimeters rather than measured in millimetres. Shells carry the load, close the surface, and decide whether small features exist at all — a rib thinner than one extrusion width simply does not print, whatever the model says. Two shells is decoration; four is a part.

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In practice

Not to be confused with

Related

How this term connects

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