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3D Printing vs Traditional Prototyping
Compare 3D printing against CNC machining, sheet metal, vacuum forming and soft tooling. Costs, lead times and which method suits your prototype.
You need a prototype. Someone has told you to 3D print it because it will be quick. Someone else has said that will not tell you anything useful and you should have it CNC machined.
Both can be right, depending on what you are trying to evaluate with that prototype.
This article covers different prototyping processes, what they cost in Australia, how long they take, and how to pick the one that suits your needs.
What is 3D Printing?
3D printing is an additive process. A machine builds a part by adding material one thin layer at a time, working directly from a 3D CAD file.
Nothing is cut away and no tooling is required. The machine simply reads the geometry and builds it.
The common technologies are:
FDM, which melts and extrudes plastic filament. Cheapest and fastest, with visible layer lines.
SLA and DLP, which cure liquid resin with light. Much finer detail and smoother surfaces, but resin parts are generally more brittle.
SLS and MJF, which fuse nylon powder. Stronger parts, no support structures needed, better for functional testing.
Metal printing, such as DMLS, which fuses metal powder. Expensive and mostly used where geometry cannot be machined.
Most 3D printed prototypes in Australia use FDM, SLA or SLS.
What is Traditional Prototyping?
Traditional prototyping covers the established methods used before 3D printing existed, and still used alongside it today.
These are mostly subtractive processes, which remove material from a solid block, or formative processes, which force material into a shape.
The main methods are:
CNC machining, which cuts a part from a solid block of material, e.g. plastic, metal, timber.
Sheet metal fabrication, which cuts, folds and welds flat sheet
Vacuum forming and thermoforming, which heat plastic sheet and pull it over a mould.
Silicone moulding and vacuum casting, which cast resin into a flexible mould.
Prototypeinjection tooling, sometimes called soft tooling, which produces parts in the real production material.
Hand fabrication, including model making, laminating and assembly work.
What’s the Difference?
Essentially 3D printing adds material. Traditional methods remove it or form it. 3D printing builds up in layers, and can build complex forms that are simply not possible with other methods. Internal channels, lattices and undercuts usually have little impact on part cost. There is no tooling and minimal setup, so the first part(s) are relatively cheap and fast compared to other methods.
Since traditional methods cut or form material, complexity usually adds cost. Every undercut needs another setup, every internal feature needs access for a tool. But the finished parts can be produced with production-grade materials, with a better surface finish and tighter tolerances. In low volumes the unit cost is typically much higher than a 3D printed version, but the part cost reduces as the volume increases.
Put simply, 3D printing is generally quicker and cheaper (particularly in lower volumes), but has limitations in material grade and finish, whereas traditional methods generally produce higher quality parts that are more expensive, but the costs reduce as the volume of parts increases.
The Main Prototyping Methods Compared
Each method suits a different question.
1. 3D Printing
What it is. Additive layer building direct from CAD, with no tooling.
Best for:
Early form studies where size and shape matter more than strength
Fast design iteration, sometimes several versions in a week
Complex geometry that would be expensive or impossible to machine.
Checking fit and clearance between parts
Appearance models, once finished and painted
Jigs, fixtures and test rigs
Limitations:
Material properties do not match production plastics
Parts can be weaker and more brittle than CNC machined versions
Surface finish usually needs hand work before it looks presentable
Tolerances are looser than machining
Cost per part stays relatively constant regardless of quantities
Typical cost per part: $50 to $500 for small and medium parts Typical lead time: 1 to 2 weeks
2. CNC Machining
What it is. A cutting tool removes material from a solid block of material, e.g. plastic, metal, or timber
Best for:
Parts that must be made in the real production material
Tight tolerances and accuracy
Load-bearing and structural components
Metal or timber parts where 3D printed plastic isn’t suitable
Prototypes that need to survive genuine testing
Limitations:
Complex geometry raises cost quickly
Deep internal features may be unachievable
Setup time makes single parts relatively expensive
Slower turnaround than printing
Typical cost per part: $200 to $2,000+ Typical lead time: 1 to 4 weeks
3. Sheet Metal Fabrication
What it is. Flat sheet is laser cut or punched, then folded, welded and finished.
Best for:
Enclosures, brackets, frames and panels
Products that will be sheet metal in production
Larger parts where printing or machining is impractical
Testing real structural performance
Limitations:
Only suits parts that can be made from folded sheet
Bend radii and tooling access constrain the design
Typical cost per part: $150 to $1,500+ Typical lead time: 3 to 4 weeks
4. Vacuum Forming and Thermoforming
What it is. Plastic sheet is heated until soft, then drawn over a mould by vacuum.
Best for:
Large covers, housings, trays and panels
Products that will be thermoformed in production
Small batches where injection tooling costs cannot be justified
Limitations:
Requires a mould, so there is a tooling cost
Wall thickness varies across the part
Not suitable for fine detail or complex undercuts
Trimming is a separate operation
Typical tooling cost: $800 to $4,000+ Typical cost per part: $50 to $500+ Typical lead time: 3 to 6 weeks
5. Silicone Moulding and Vacuum Casting
What it is. A master pattern, often 3D printed, is used to make a flexible silicone mould. Resin is then cast into it under vacuum.
Best for:
Batches of roughly 5 to 20 identical parts
Parts that need to look and feel close to moulded production parts
Overmoulded and soft-touch effects
Clear and coloured parts
Pre-production samples and photography
Limitations:
Moulds wear out after about 20 to 25 shots
Cast resins approximate production plastics rather than matching them
Not economical beyond small batches
Typical master and mould cost: $1,500 to $5,000 Typical cost per part: $80 to $400 Typical lead time: 3 to 6 weeks
6. Prototype Injection Tooling
What it is. A simplified aluminium or soft steel mould, producing parts in the actual production plastic.
Best for:
Parts that must be tested in the true production material
Pilot runs and market trials of 100 to several thousand units
Validating the moulding process before investing in production tooling
Regulatory and compliance testing
Establishing a quality benchmark
Limitations:
Highest upfront cost of any prototyping method
Longest lead time
Design changes after the tool is machined are expensive
Tool life is limited compared with production tooling
Typical tooling cost: $3,000 to $15,000+ Typical cost per part: $5 to $50 Typical lead time: 6 to 8 weeks
3D Printing vs Traditional Prototyping and When to Use Each One
Where 3D Printing Wins
Speed on the first part, measured in days rather than weeks
Cost when you only need one or two
Complex internal geometry at no extra charge
Rapid iterations
Checking whether parts fit together
Producing master patterns for silicone moulding
Making jigs and test fixtures for other work
Where Traditional Methods Win
Testing genuine mechanical performance
Any part that needs to be metal or timber
Tight tolerances and flat, accurate surfaces
Higher quality surface finish
Parts larger than a 3D printer bed
Higher volume batches
Where the production material requires testing
Common Mistakes With Printed Parts
Testing a 3D printed part and assuming the production part will behave the same way.
It usually will not, for three reasons.
Material. A printed nylon or resin part is not the same polymer as the injection moulded ABS or polypropylene you intend to produce. Stiffness, impact resistance and temperature behaviour all differ.
Direction. FDM printed parts are weaker along the layers than across them. A bracket that survives a load in one orientation can fail at a fraction of that load when printed the other way. Injection moulded parts do not behave like this.
Tolerance and fit. A snap fit that works on a printed part may be too tight or too loose in the moulded version, because the achievable tolerances are different.
Printed parts are excellent for answering whether something is the right shape and whether the pieces go together. They are much less reliable for answering other aspects e.g. durability.
Where strength or durability is the question, a plastic part usually needs to be machined in the production material or moulded from a prototype tool.
What Drives Cost
For 3D printing:
Part volume, since machine time and material both scale with size
Technology, with SLA and SLS costing more than FDM
Layer height, where finer layers mean longer builds
Support material and the labour to remove it
Post-processing such as sanding, priming and painting, which often costs more than the print
For traditional methods:
Setup and programming time, which is fixed regardless of quantity
Geometric complexity, particularly features needing extra setups
Material,especially engineering plastics and high-grade metals or timber
Tolerance requirements
Custom tooling, where required
Finishing, coating and treatment
How We Use Both at Concept Evolution
Our Sydney workshop has 3D printing on site, which we use for rapid iteration, form studies, fit checks and master patterns. Being able to print in the morning and review the part after lunch shortens the design cycle considerably.
For specific materials, processes or treatments we use our network of manufacturing partners, covering metal fabrication, injection moulding, thermoforming and extrusion.
In-house 3D printing has not made us treat printing as the answer to everything. On a load-bearing plastic bracket or a part whose behaviour under stress needs to be tested, a printed sample can be misleading, and we will usually recommend machining it or building a soft tool instead.
Some projects require both. A form is resolved through printed iterations, then validated in the production material.
The Concept to Production Pathway
Prototyping is easier to plan when you can see where it sits in the wider process.
At Concept Evolution, projects typically move through four general stages. Each one resolves details or issues in the design before the next stage begins.
1. Design Review
We start by reviewing your product idea from several perspectives, to refine the design brief and guide concept development.
The questions we work through include:
What is the need for this product?
Who will use it, and how?
What is the market opportunity?
What materials and processes could be used to make it?
What technical or regulatory requirements apply?
2. Concept Development
We take the refined brief and explore multiple design directions in both form and function, using:
Concept sketches
3D CAD modelling
Detailed 3D product visualisations
We work closely with you to refine the design and prepare it for physical development and evaluation.
3. Prototype and Test
Prototypes range from basic form studies, which assess size and shape, through to high-fidelity working prototypes.
Our workshop is equipped to assemble and test prototypes, including in-house 3D printing for rapid prototyping, which makes evaluating a design fast and economical. For specific materials, processes or treatments, we use our network of manufacturing partners.
Some products advance to production after one prototype. Others require revision and further rounds of prototyping, testing and refining.
4. Production
When you approve the final prototype, the product is manufactured and goes to market.
It is optimised for efficient mass production through design for manufacturing (DFM), and to comply with the relevant regulations and standards.
We can manage production for you through our network of trusted manufacturing partners in Australia and overseas, or work with your own manufacturing network.
How the Right Method Reduces Risk
Choosing the wrong process can waste money in two ways.
Over-specifying means paying for a machined or moulded part to answer a question a $90 print would have settled. Under-specifying means testing a printed part, believing the result, and finding the problem after tooling is committed.
A well-chosen prototype answers questions like:
Is this the right size and shape in the hand?
Do the parts actually assemble in the intended order?
Will this component carry its load in the production material?
Are these tolerances achievable in the process we plan to use?
Does the surface finish meet the standard customers expect?
Can this be manufactured at the cost the business case assumes?
Answering these questions earlier in a products development can avoid costly fixes down the track.
Prototyping in Sydney and Australia
Prototyping is usually best managed by the design team, because the process is iterative and evaluation and refinement of the design can be done more quickly. Australian businesses commonly develop and prototype locally, then decide separately whether production runs onshore or overseas based on volume and cost.
Sydney has a good base of machining, fabrication and moulding capability. That makes it practical to run prototype iterations quickly without shipping parts internationally and waiting weeks between versions.
Concept Evolution is based at Taren Point in southern Sydney, with studio and workshop space on the same site. We work with clients across Australia and internationally, in three broad groups:
Manufacturers extending into design without building an in-house design team
Brands and businesses improving or extending an existing product line
Startups and inventors developing a product for the first time
Key Takeaways
3D printing is additive and needs no tooling. Traditional methods remove or form material and often require tooling.
3D printing is cheapest and fastest in small volumes. Traditional methods are more expensive, but cost decreases as volumes increase.
Printed parts are reliable for size, shape and fit, and unreliable for strength and durability.
FDM printed parts are directionally weaker along layers, which production parts are not.
Expect roughly $50 to $500 per printed part in 1 to 2 weeks, $200 to $2,000+ per machined part in 2 to 4 weeks, and $3,000 to $15,000+ for a prototype injection tool in 4 to 8 weeks.
Silicone moulding suits batches of about 5 to 20 near-production parts.
Post-processing a printed part often costs more than the print itself.
Most products use both approaches, printing to resolve the form and traditional methods to validate it.
Frequently Asked Questions
What is the difference between 3D printing and traditional prototyping?
3D printing is an additive process that builds a part layer by layer from a CAD file, with no tooling required. Traditional prototyping covers subtractive and formative methods such as CNC machining, sheet metal fabrication, vacuum forming and silicone moulding, which remove or shape material and often need a mould or setup. 3D printing is faster and cheaper for single parts. Traditional methods give better material accuracy, tighter tolerances and lower cost per part at higher quantities.
Is 3D printing cheaper than CNC machining?
For smaller volumes, usually yes. A printed part typically costs $50 to $500 while a machined part typically costs $200 to $2,000. Printing cost stays roughly the same per part regardless of quantities while machining cost per part falls once the setup is done and quantities increase. Machining also produces parts in production-grade materials with tighter tolerances.
Can you test strength using a 3D printed prototype?
Yes, but with limitations. Printed parts use different materials from production parts and are often weaker compared to formed or moulded parts due to the differences in manufacturing processes, so a printed part can fail at a load the production part would handle easily, but sometimes the opposite can happen. For genuine strength and durabilty testing the part ideally needs to be machined in the production material or moulded from a prototype tool.
How long does 3D printing take compared to traditional prototyping?
A 3D printed part is typically ready in 1 to 5 days. CNC machining and sheet metal fabrication usually take 2 to 4 weeks. Vacuum forming takes 3 to 6 weeks including tooling, and prototype injection tooling takes 4 to 8 weeks. Post-processing and finishing add time to all of them.
When should you use silicone moulding instead of 3D printing?
Silicone moulding, also called vacuum casting, suits batches of roughly 5 to 20 parts that need to look and feel close to moulded production parts. In lower volumes, printing each one is usually cheaper. Above approx. 20 shots, the silicon mould wears out, and prototype injection tooling becomes more economical if higher volumes are required.
Does 3D printing replace traditional prototyping?
No. It has replaced traditional methods for early form studies, fit checks and fast iteration, which is where most of its value sits. Traditional methods remain necessary for real material testing, metal or timber parts, tight tolerances, large components and batches beyond about ten units. Most product development programs use both.
What is a prototype injection tool and when is it worth it?
A prototype injection tool, sometimes called a soft tool, is a simplified aluminium or soft steel mould that produces parts in the actual production plastic. It typically costs $3,000 to $15,000+ and takes 4 to 8 weeks. It becomes worthwhile when you need to test real material behaviour, run a pilot batch of a hundred or more units, complete regulatory testing, or validate the moulding process before committing to production tooling.
Which prototyping method should I choose for my product?
It may depend more on what needs to be tested rather than the product itself. If you need to check size, shape or fit, 3D printing is usually fastest and cheapest. If you need to test strength, tolerance or real material behaviour, machining or soft tooling is more reliable. Most products use printing early and traditional methods later.
Final Thoughts
There is no method that is better in general. Each method has its own strengths and weaknesses, and it is generally up to the design team to decide which method will be most suitable based on the specific part design and what needs to be tested at a particular stage in a product’s development.
If you have a design and are not sure how to make it, send it to our experienced team. We can guide you on which method would be the most practical, economical, and beneficial for your needs.
Talk to the Concept Evolution team or call +61 2 9521 5502.
Concept Evolution is an industrial design, engineering and manufacturing company based at Taren Point in Sydney. Over 20 years, more than 200 projects delivered, and more than 70 clients across Australia and internationally. Our services span new product development, design and engineering, and prototyping and manufacturing. If you are new to this, start with what a product prototype is and which type you need.