Top 6 FAQs About 3D Printing: Expert Answers from CADimensions

Why Opt for 3D Printing?

3D printing offers a cost‑effective pathway to validate designs before committing to expensive tooling. By producing a handful of prototypes, you can assess fit, form, and function in a fraction of the time and budget required for traditional manufacturing. Additionally, 3D printing frees up machine‑shop capacity—many shops face backlogs that delay critical components. With 3D printers running unattended overnight, production can be accelerated, enabling faster iteration and delivery.

Understanding FDM and PolyJet Printing Technologies

At CADimensions, we provide two industry‑standard methods: Fused Deposition Modeling (FDM) and PolyJet. FDM builds parts by extruding thermoplastic filament layer by layer, producing a characteristic visible layering effect. The technology supports a broad spectrum of materials—ABS, PETG, TPU, and more—making it suitable for functional prototypes and end‑use parts. PolyJet, on the other hand, jets liquid photopolymer resin in micro‑droplets and cures each layer with UV light. The result is an ultra‑fine layer resolution ideal for high‑detail parts, such as dental models or complex molds. However, PolyJet parts are generally more brittle, so we recommend them for non‑load‑bearing applications.

Choosing the Right Infill Density for Your Parts

In FDM printing, infill density directly influences a part’s weight, strength, and material cost. Our quoting system offers three preset options:

• Solid – 100% fill for maximum strength, but also the heaviest and most expensive choice.
• Sparse – ~18% lattice fill, ideal for lightweight or budget‑constrained parts.
• Double Dense – ~36% fill, striking a balance between reduced weight and retained structural integrity.

Material Anisotropy in 3D Printed Parts

FDM parts exhibit anisotropic behavior: they are strongest when forces act perpendicular to the layer lines. When load is parallel to the layers, delamination can occur. PolyJet parts are closer to isotropic due to finer layering, yet they still favor perpendicular loading. Design your part orientation accordingly to meet performance requirements.

Tolerance Levels Achievable with FDM and PolyJet

Tolerance depends on geometry and technology. With Stratasys FDM machines, we typically guarantee dimensional accuracy within one layer height. PolyJet offers tighter tolerances: the J850 model achieves ±100 µm for parts ≤100 mm and ±200 µm (or 0.06 % of part length, whichever is greater) for larger pieces. For precision‑critical components, PolyJet is the preferred choice.

Design Tips for Optimized 3D Printing

Successful additive manufacturing begins with thoughtful design. Consider the following guidelines for FDM, the most widely used method:

• Overhangs – Since material cannot be deposited into the air, overhangs need support. Stratasys’ soluble support material allows virtually any geometry, but you can reduce cost and post‑processing time by designing self‑supporting features. Overhang angles of 45° or greater typically eliminate the need for additional supports.

For more information or to discuss your specific project, contact us at csb@CADimensions.com. Our team of experienced engineers is ready to help you achieve the best results from your 3D printing projects.

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