01763 249760  office@prototypeprojects.com

Request a Quote
Specialist in the manufacture of prototypes - Prototype Projects Specialist in the manufacture of prototypes - Prototype Projects
  • CNC Machining
    • CNC Turning
    • CNC Milling
    • CNC Materials
    • CNC Finishing
    • Service Levels
  • 3D Printing
    • SLS – Selective Laser Sintering
    • SLA – Stereolithography
    • Projection Micro Stereolithography (PµSL)
    • Polyjet 3D Printing
    • DLP – Digital Light Projection
    • SLS Dyeing
    • 3D Printing Materials
    • 3D Printing Finishing
    • Service Levels
    • Additive Manufacturing
    • Additive Prototyping
  • Vacuum Casting
  • Model Making
  • Expertise
    • Low Volume Manufacturing
    • Rapid Prototyping
    • Laser Cutting
    • Inspection
  • Downloads
    • Frequently Asked Questions
    • Guides and whitepapers
    • Policies, forms and certificates
    • Process datasheets
    • Prototype materials datasheets
  • About
    • Customers
    • Our Team
    • Our values
    • Payment methods
    • Work with us
    • News & Articles
    • Case Studies
    • Plant list
    • Privacy statement
  • Contact
  1. Home
  2. 3D Printing
  3. Why build orientation matters for 3D printing

Why build orientation matters for 3D printing

Why does build orientation matter for 3D printing?

When customers order 3D printed parts, we may well ask a few questions to clarify certain points. This helps us to deliver parts that are fit for purpose. One of the most common questions relates to build orientation. But why does build orientation matter for 3D printing?

Build orientation and strength

In 3D printing, parts are built layer by layer. Depending on the process, this can result in a part whose material properties are anisotropic.

Processes that use light to cure liquid resins (for example, SLA, DLP and Polyjet) produce parts whose properties are effectively isotropic. In contrast, processes that melt and solidify plastics (SLS and FDM) typically result in parts whose strength in the X and Y axes is several times greater than that in the Z axis. This is due to the inter-layer bond strength being lower. If strength is critical for a part’s performance, then the part might need to be orientated to ensure the load paths are not in the Z axis. This information must be provided by the customer.

Build orientation and surface finish

If 3D printing processes had infinitesimally small resolutions in the X, Y and Z axes, then build orientation would not influence surface finish. However, 3D printers do have a resolution in the X and Y axes, and the layer depth gives the Z axis resolution. Any resultant micro stepping can be sanded smooth, but the amount of finishing required can be minimised by selecting the build orientation to suit the part’s surface geometry. Usually, the resolution in the X and Y axes is better. As a result, a radius in the XY plane will have a smoother surface than a radius in the XZ or YZ plane.

Build orientation and distortion

3D printing is an additive manufacturing process. Each time new material is added, whether by curing a liquid resin, melting a powder, or extruding molten plastic, it will affect the material to which it is bonding. This can give rise to residual stresses and result in distortion or, sometimes, delamination. Careful consideration of build orientation can help to minimise or prevent distortion, depending on the 3D printing technology and the part’s geometry.

Support structures for 3D printing (SLA, DLP, FDM & Polyjet)

In some cases, the choice of orientation can be influenced by the desire to minimise support structures. If a part has an overhang or bridging feature, a skeletal support structure may be required to prevent the part drooping under the influence of gravity while it is being built. Support structures add cost due to the material and build time required. In addition, post-processing time is required for removing the structure and, when necessary, cleaning up any witness marks left by the supports. It is worth noting also that the DLP process will need to have substantially more support than SLA due to the inverted print direction.

We never select a build orientation with a view to saving costs by minimising support structures.

SLS parts do not need supporting as they are suspended within un-sintered powder during the whole build process.

Build orientation and build time

The more layers a part needs, the longer the build time. If time is of the essence, you might choose to orientate the part to minimise the Z axis dimension. However, as we have seen already, build orientation also influences other key parameters such as strength and surface finish.

We never orientate parts to minimise build time (unless speed is more important). Instead, we select an orientation that produces parts with the requisite strength and surface finish.

The world is not ideal, but this is where experience counts

Customers may require parts with a high-quality finish on more than one face. Or parts capable of withstanding loads in more than one direction. Because we have been 3D Printing for over 20 years, we have printed many hundreds of thousands of parts using our five different 3D printing technologies and in multiple materials, we can overcome these challenges.

First of all, our 3D printing operatives are highly experienced, so they can often resolve issues such as delamination and distortion by fine-tuning the parameters on the 3D printer. But this approach cannot overcome every problem encountered.

Sometimes, it is sufficient to simply orientate the part at 45 degrees. Alternatively, a small offset can orientate an overhang at an angle of less than 45 degrees from vertical, which avoids the need for a support structure.

Depending on the purpose for which the part is required, it might be that 3D printing it with SLA instead of a lower-cost process provides isotropic material properties and, therefore, the necessary strength in all three axes. Indeed, switching to an alternative 3D printing process or material can be a simple way to solve issues relating to build orientation.

For larger parts in particular, we sometimes split the part into two, three or more elements. Building these separately and then assembling them can result in a final part that meets the necessary criteria, without having to compromise on other aspects, this would generally be done for a visual model where strength is less important.

Support structures are created automatically, using specialist software, when we prepare CAD models for downloading to the 3D printer. However, we use our expertise and experience to adjust support structure designs manually if, for example, we want to keep witness marks away from critical areas on the finished part’s surface, especially if there are internal features that cannot have support as there is no access to remove them.

Complementary technologies

If a part has features with critical dimensions, one option is to CNC machine those features into the 3D printed part. Or a secondary component can be CNC machined and bonded to the 3D printed part. This is straightforward for us, as we have CNC machining facilities in-house.

Because we have both 3D printing and CNC machining facilities, we can also give unbiased advice on whether a part is best produced by 3D printing or CNC machining. The latter is sometimes the better option, particularly if material isotropy and precision are both critical.

Another way to produce prototype parts with particular material properties is to vacuum cast the parts. Take a look at our article about the benefits and features of Vacuum Casting here.

Conclusion

By now, you might have decided that build orientation is a complex subject and, indeed, there is much to consider. Nevertheless, we usually find that a quick conversation with the designer allows us to select a build orientation and supply the part with the required characteristics.

Our extensive experience with multiple 3D printing technologies and materials gives us a deep understanding of build orientation. This enables us to manufacture high-quality prototype parts so designers can focus on product development.

Talk to us

If you need 3D printed prototype parts or have any questions about build orientation, talk to us on 01763 249760.

Recent Popular
SLS Close-up

When is SLS your best option for ...

27 February 2023 Comments Off on When is SLS your best option for 3D printing?
Materials choices for SLA - Headlight

What are the material choices for SLA ...

23 February 2023 Comments Off on What are the material choices for SLA 3D printing? 
Star of the Month - Prototype Projects

Star of the Month

6 February 2023 Comments Off on Star of the Month
Projection Micro Stereolithography

What do we mean by ‘Precision’ ‘Micro’ ...

23 January 2023 Comments Off on What do we mean by ‘Precision’ ‘Micro’ Stereolithography?
3D Printing

The beginner’s guide to 3D printing

19 January 2023 Comments Off on The beginner’s guide to 3D printing
Prototyping medical devices for patient contact

Prototyping medical devices for patient contact

22 September 2021 0
silicone tooling

LUMA-iD develops Buddy with silicone tooling

21 July 2022 0
Applications and design tips for SLS: a guide

Applications and design tips for SLS: a ...

27 November 2019 0
From 3D Model to Award-Winning E-Bike in Record Time

From 3D Model to Award-Winning E-Bike in ...

16 September 2021 0
SLS Close-up

When is SLS your best option for ...

27 February 2023 Comments Off on When is SLS your best option for 3D printing?

Comments are closed

Next Day Dispatch

Delivering Overnight Printing

Email: office@prototypeprojects.com
Tel: 01763 249760

Prototype Projects Ltd
Units 1&2, Greenfield
Royston,
Herts SG8 5HN

If you have questions about any aspect of our service, please contact us.


    UKAS
    Made In Britain - Prototype Projects
    Royston Business Awards - Prototype Projects
    Specialist in the manufacture of prototypes - Prototype Projects

    Sign up to our Company and Industry newsletter

    Sign up here
    Specialist in the manufacture of prototypes - Prototype Projects

    Prototype Projects, established in 1980, is a specialist in the manufacture of prototypes. The company is experienced in 3D Printing, CNC Machining, Rapid Prototyping, Model Making and Additive Manufacturing. The company is located in Royston, Hertfordshire.

    Trustpilot - Prototype Projects

    About | Our team | Our values | Customers | Work with us

    CNC Machining

    CNC Turning
    CNC Milling
    CNC Materials
    CNC Finishing
    Service Levels

    3D Printing

    SLS
    SLA
    PµSL
    Polyjet
    Digital Light Projection
    3D Printing Materials
    3D Printing Finishing
    Additive Manufacturing
    Additive Prototyping
    Service Levels

    Expertise

    Low Volume Manufacturing
    Rapid Prototyping
    Laser Cutting
    Inspection

    Contact us

    Prototype Projects Ltd
    Units 1 &2, Greenfield
    Royston
    Herts SG8 5HN

    office@prototypeprojects.com
    T: 01763 249760

    © 2022 - Prototype Projects | Terms | Privacy | Web Design Indigo Ross

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies.
    However, you may visit Cookie Settingsto provide a controlled consent. Reject All
    ACCEPT ALL
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
    CookieDurationDescription
    cookielawinfo-checkbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
    cookielawinfo-checkbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
    cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
    cookielawinfo-checkbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
    cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
    viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
    Functional
    Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
    Performance
    Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
    Analytics
    Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
    Advertisement
    Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
    Others
    Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
    SAVE & ACCEPT