Who this is for: Businesses developing an industrial prototype, testing a component or reconstructing a model from an existing physical part.
Studio Dinamico supports industrial prototype consulting, technical design and 3D model development. Where a physical sample is needed, we coordinate 3D printing and CNC machining through partners. The starting point is the decision the prototype needs to support: checking an envelope, assembly, function or alternative construction.
Choosing CNC machining or 3D printing involves more than looking at the part’s shape or quoted unit price. First establish the test, the characteristics that must be representative and the changes still likely to occur. Compare a sample ready for its intended use, including the operations needed to get it into that condition.
The two process families offer different possibilities. Within 3D printing, technologies, materials and post-processing requirements also differ. A generic request for a printed part is therefore insufficient to compare technically equivalent proposals or decide how the test results will relate to the intended production product.
Rank the test requirements before asking for a price
For an envelope check, some material properties may be secondary. For a fit or load-related assessment, material, functional surfaces and configuration become decisive. List mandatory characteristics separately from those that can be adapted. This helps avoid selecting an inexpensive proposal that cannot answer the actual question the sample is intended to resolve.
Quantities also need to be considered alongside expected revisions. Ten identical parts ordered once are a different requirement from ten successive design iterations. Establish whether all samples are needed immediately or whether making and assessing one specimen first would allow useful changes before the remaining pieces are commissioned. The quotation should reflect the intended sequence.
Scroll horizontally to see every column.
| Test priority | Information to request |
|---|---|
| Representative material | Material identification and supplied condition |
| Mating interfaces | How functional surfaces will be made and inspected |
| Complex geometry | Access, orientation or support-removal constraints |
| Frequent revisions | Which preparation activities repeat for each version |
| Test-ready sample | Included finishing, assembly and checks |
Assess the constraints of the actual geometry
CNC machining requires consideration of tool access and how the workpiece will be held. Additive manufacturing requires the design rules of the selected technology, including relevant support and post-processing needs. Protolabs’ technical resources discuss these issues separately for the different processes.
The choice does not have to be exclusive. It may be worth assessing a component made by one process with selected surfaces finished through another, provided the complete route is defined and quoted. Focus on achieving the required result rather than assigning universal capabilities to the terms CNC or 3D printing. A supplier should explain how the proposed route addresses the features that matter to your test.
References: Protolabs — Design Essentials for CNC Machining · Protolabs — Design for 3D Printing Toolkit
Compare the cost of a test-ready sample
One quotation may include only an unfinished part while another covers cleaning, finishing, secondary machining and inspection. Compare the same model revision, required material, quantity and acceptance characteristics. State whether dimensional reports, sample identification or assembly with existing components are needed. Otherwise apparently similar quotations can represent different deliverables.
The useful project timescale includes activities before and after manufacture: data preparation, technical questions, material sourcing and access to the test equipment. Earlier delivery of a semi-finished part does not necessarily bring the decision forward. Asking for the sequence of activities reveals dependencies that a unit price or machine-time estimate cannot show, including work the business itself must complete.
Record what the selected process allows you to conclude
The sample record should identify material, process, revision, finish and differences from intended production. This information is needed to interpret the test. If the result depends on a characteristic that will change in production, plan further evidence instead of automatically extending the conclusion to the finished product.
A good decision may be deliberately temporary: choose a suitable route for a geometry assessment now and a more representative test once the design is stable. Production needs a separate comparison based on volume, supply continuity, inspection and required investment. The process used for the first sample should not constrain every later stage without a reason. Keep the learning objective and the eventual manufacturing objective distinct.
Start from an existing part: reverse engineering and 3D scanning
Where CAD is unavailable or an existing component needs modification, reverse engineering can establish a basis for technical reconstruction. Studio Dinamico offers this service, with 3D scanning carried out through partners. Before acquisition, define important surfaces, reference features, access and intended model use: visualisation, redesign or a new prototype.
A scan records the available geometry, including wear and deformation. It does not automatically establish original material, tolerances or functional intent. Separate measured data from reconstructed design decisions and identify dimensions requiring additional validation. The business should provide a component it is authorised to use for the project.
Request technically comparable proposals
- State the test question and characteristics that cannot change.
- Supply an identified model revision and functional requirements.
- Separate mandatory material requirements from acceptable alternatives.
- Request an itemised scope for finishing, post-processing and inspection.
- Explain quantities, expected iterations and the actual test date.
Common questions
Is 3D printing always faster?
That cannot be decided without the specific part and route. Technology, size, preparation, post-processing and supplier availability affect the test-ready delivery. Compare when the sample can be used, not just the stated machine time.
Can a printed prototype assess a part that will be CNC machined?
It can help answer some questions, such as envelope and access. If the test depends on material, finish or surface behaviour, assess whether the sample is representative and identify which conclusions need further verification.
Do you carry out 3D printing and CNC machining in-house?
Our main role is prototype consulting, technical design and 3D model development. We coordinate physical 3D printing and CNC machining through partners, defining the specifications, finishing and sample checks.
Can you work from a physical part without drawings?
Yes. We can assess reverse engineering with partner-delivered 3D scanning where appropriate. We need the part’s function, condition and the characteristics the reconstructed model must preserve.
Sources and further reading
Apply this to your project.
Have an idea, CAD model or existing part to develop into a prototype? Describe its function and intended test to discuss the 3D design and partner manufacturing route.
Discuss your industrial prototype