Eiger Update Adds Internal Concentric Fiber Reinforcement for Efficient 3D Printing

Responding to user requests, the latest Eiger release introduces internal reinforcement for Concentric Fill. This upgrade offers greater design flexibility while cutting fiber consumption. Below we explain how to make the most of this feature.

Reinforcement Options

When both “Use Fiber” and “Concentric Fill” are enabled, Eiger presents three reinforcement choices in the “Walls to Reinforce” drop‑down:

Outer Shell Only: Adds concentric rings along the part’s perimeter, reinforcing the outer shell for improved bending resistance around the Z‑axis.

Inner Holes Only: Applies concentric rings to every internal cavity, hole, or void—an economical way to strengthen features that would otherwise be weak.

All Walls: Combines both outer and inner reinforcement, delivering the maximum structural benefit in a single setting.

When to Use the New Concentric Options

These options are exclusive to Concentric Reinforcement. During Isotropic Reinforcement, all walls receive parallel fibers by default to ensure a smooth surface. By choosing the appropriate concentric setting, you can avoid unnecessary isotropic fiber use, saving time and material.

Reinforcing Internal Cavities

The Inner Hole Reinforcement mode is ideal for strengthening bolt holes or other internal features against torsional forces perpendicular to the axis. Concentric rings clamp the cavity walls, preventing deformation and delivering a cost‑effective solution.

Backing Up Fasteners and Embedded Components

Markforged printers already make it simple to embed parts. With the new fiber routing, you can reinforce the walls around embedded components—such as nuts or brackets—to achieve stronger fastener connections while conserving fiber.

Greater Fiber Routing Control

These options grant designers precise control over where fiber is placed, enabling efficient use of material without compromising part performance. Focus on the structural needs of your design, not on fiber consumption.

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