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3D Printing

Published on Friday, 23. August 2024

Content Guide：Everything we do at Slinar is focused on providing the fastest and highest quality prototypes and production parts in the industry. This demands the latest technology, managed by tight process controls

What is 3D printing?

3D printing builds parts layer by layer from digital 3D models. Unlike CNC machining which removes material, 3D printing adds material only where needed, enabling complex internal channels, organic geometries, and lattice structures that are impossible or expensive to machine.
What are the main 3D printing technologies?

FDM extrudes molten plastic filament layer by layer. SLA uses a UV laser to cure liquid resin. SLS uses a laser to fuse powder material. DMLS prints metal parts directly.
When should I choose 3D printing over CNC machining?

Choose 3D printing when your part has complex internal channels, organic surfaces, or features that are impossible to access with cutting tools. Choose it for rapid iteration when the design is still changing.
What are the limitations of 3D printing?

Tolerances are generally looser than CNC machining. Layer lines are visible and affect surface finish. Part size is limited by build volume. Not all materials are available for all processes.
What is the typical lead time for 3D printing?

Lead times are typically faster than CNC machining—same day to a few days for many parts, making 3D printing ideal for rapid prototyping and fast iteration cycles.
What is topology optimization?

A computational design method that finds the most efficient material distribution within a defined design space for given loads and constraints. The algorithm produces organic geometry using material only where it provides structural benefit.
What is the 45-degree rule?

Most FDM prints require supports once you exceed approximately a 45° overhang angle. If a surface matters cosmetically or functionally, orient the part so that surface is not a supported face.
What post-processing is available?

Sanding removes layer lines. Vapor smoothing creates an optical glass-like finish. Bead blasting creates uniform matte texture. Painting and coating improve appearance and durability.
How do I choose between FDM, SLA, and SLS?

FDM is cost-effective for functional plastic parts and quick iterations. SLA offers fine detail and smooth surfaces. SLS requires no supports and produces strong durable parts.
How does 3D printing compare to injection molding?

3D printing has no tooling cost, enables fast iteration, but has higher per-part cost and is limited to low volume. Injection molding has high tooling cost but low per-part cost and is ideal for high volume.

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