How Are Custom Carbon Fiber Parts Made? OEM Process Guide

Podium	Main Decision
Drawing review	What does the part need to do?
Process selection	Which manufacturing method fits the geometry and volume?
Material selection	Which fiber and resin system are appropriate?
Layup design	Which fiber directions support the actual loads?
Gereedschap	Does the part require a mold, mandrel, or fixture?
Forming & curing	How should the laminate be consolidated and cured?
Secondary machining	Which holes, profiles, or cut lengths are required?
Inserts & assembly	How will the carbon fiber connect to other parts?
Inspectie	Which dimensions and features are critical?
Productie	How will the approved part be reproduced consistently?

A reliable custom carbon fiber project should consider the complete process before production begins.

Step 1: Review the Drawing and Application

The drawing shows the geometry.

The application explains why the geometry matters.

Both are important.

Before selecting a carbon fiber manufacturing process, the supplier should understand four areas.

Dimensions and tolerances

Important information may include:

Totale afmetingen
Tube OD and ID
Wanddikte
Plaatdikte
Diameter van het gat
Positie van het gat
Slots and cutouts
Assembly dimensions
Critical tolerances

Not every dimension needs the same tolerance.

For example, a bearing hole or telescopic tube fit may require tighter control than a non-functional outside edge.

Over-specifying tolerance can increase machining and inspection cost without improving product performance.

Load and function

The manufacturer should know whether the part experiences:

Bending
Tension
Compression
Torsion
Vibration
Impact
Buckling
Combined loads

Carbon fiber is directional, so the layup should match the actual loading condition.

Current material

If the carbon fiber component is replacing an existing part, provide:

Current material
Current weight
Current dimensions
Existing problem
Streefgewicht
Required improvement

For example, the goal may not be to make a tube stronger.

The real goal may be to achieve similar stiffness at significantly lower weight.

Operating environment

Environmental conditions may affect the resin, surface finish, adhesives, and metal fittings.

Useful information includes:

Gebruik binnenshuis of buitenshuis
Working temperature
Water exposure
Salt exposure
UV exposure
Chemical exposure
Electrical requirements

The earlier these conditions are known, the easier it is to select the right material system.

Step 2: Choose the Right Manufacturing Process

There is no single best carbon fiber manufacturing process.

The correct process depends on:

Product geometry
Load
Vereisten inzake oppervlakte
Verdraagzaamheid
Aantal
Tooling budget
Target unit cost

A practical starting point looks like this:

Producttype	Typical Manufacturing Route	Main Reason
Straight carbon fiber rod	Pultrusie	Efficient for constant profiles
Standard straight tube	Pultrusion or tube-forming process	Suitable for simple geometry
Custom structural tube	Roll wrapping or controlled tube layup	Better control of wall and fiber direction
Telescopische buisdelen	Custom tube production + precision finishing	OD/ID fit and straightness matter
Koolstofvezelplaat	Lamination / press processing	Produces flat laminate
CNC-plaat van koolstofvezel	Laminate + CNC machining	Suitable for complex profiles and holes
Curved visible part	Prepreg molding	Better control of shape and appearance
Complex 3D structural part	Prepreg / vacuum / molded process	Suitable for shaped components
Repeat molded OEM component	Compression molding where appropriate	Better production repeatability
Cylindrical wound structure	Filament winding where appropriate	Controlled fiber placement around an axis

This table is a guide, not a fixed rule.

The same part may be manufactured in more than one way.

The decision should be based on performance and production economics rather than simply choosing the most expensive process.

For a deeper comparison of tube manufacturing methods, link internally to:

Pultruded vs Roll-Wrapped Carbon Fiber Tubes

Step 3: Select the Carbon Fiber and Resin System

A CFRP component consists of:

Carbon fiber + resin matrix

Both affect the finished part.

Kwaliteit van koolstofvezel

Different carbon fibers provide different combinations of:

Tensile strength
Modulus
Elongation
Processing behavior
Kosten

A higher fiber grade does not automatically create a better product.

For many commercial components, layup, wall thickness, geometry, and connection design can be more important than simply changing from one fiber grade to another.

Resin system

The resin affects:

Cure process
Heat resistance
Moisture resistance
Chemical resistance
Impact behavior
Surface quality
Production cycle

The resin should be selected for the actual operating environment.

A carbon fiber component used indoors at room temperature does not necessarily need the same resin system as a component exposed to high heat, chemicals, or continuous outdoor use.

Step 4: Design the Layup Around the Load

Carbon fiber does not behave like an isotropic metal.

Fiber direction matters.

Typical orientations include:

0° fibers for lengthwise strength and bending stiffness
±45° fibers for torsion and shear
90° or circumferential fibers for transverse support and splitting resistance
Woven fabric for more balanced properties and visible surface appearance

The correct laminate often combines several directions.

For example, a long carbon fiber tube may need:

Longitudinal fibers for bending
Angled fibers for torsion
Circumferential reinforcement around clamps or inserts

This is why specifying only:

“3K carbon fiber”

does not define a structural part.

3K may describe the tow or visible weave, but it does not describe the complete laminate design.

Step 5: Decide What Tooling Is Required

Tooling has a major effect on both sample cost and production cost.

Different products require different tooling.

Carbon fiber tubes

Tube production may require:

Mandrels
Wrapping fixtures
Cure tooling
Grinding fixtures
Cutting fixtures

Telescopic tubes may also require additional finishing to control OD, ID, straightness, and section fit.

CNC carbon fiber plates

A flat CNC plate may not need a dedicated 3D mold.

A laminate sheet can first be produced and then CNC-cut to the final shape.

This is often practical for:

Beugels
Drone-kentekenplaten
Machine panels
Fixtures
Small-volume custom parts

Molded carbon fiber parts

A curved or complex component may require:

Mold tooling
Trimming fixtures
Drilling fixtures
Assembly fixtures

Tooling becomes more important as production volume increases.

Prototype Tooling vs Production Tooling

Prototype and production tooling do not always need to be identical.

A prototype may use a simpler method to verify:

Geometry
Pasvorm
Surface appearance
Gewicht
Montage
Basic function

Once the design is approved, production tooling may be optimized for:

Faster cycle time
Better repeatability
Easier demolding
Consistent hole position
Lower labor cost

This is why expected annual quantity should be discussed early.

A tooling method suitable for five samples may not be economical for thousands of parts.

Step 6: Lay Up and Form the Carbon Fiber

Once the tooling and laminate design are defined, the carbon fiber material is placed into or around the tool.

Depending on the process, this may involve:

Prepreg
Dry reinforcement
Woven carbon fabric
Unidirectional material
Chopped carbon molding material

Layers are arranged according to:

Fiber direction
Vereiste dikte
Local reinforcement
Vereisten inzake oppervlakte

Local reinforcement

Critical areas may need additional reinforcement around:

Holes
Tube ends
Inserts
Clamp areas
Bolted joints
High-load corners

Adding reinforcement only where it is needed can be more efficient than increasing the thickness of the entire part.

Cosmetic surfaces

If appearance matters, additional attention may be required for:

Weave alignment
Fabric distortion
Seams
Resin-rich areas
Surface pinholes

Structural and cosmetic requirements should be specified separately.

Step 7: Consolidate and Cure the Part

The laminate must then be consolidated and cured.

Depending on the material system and product, possible processes include:

Vacuümverpakking
Oven curing
Out-of-autoclave curing
Press molding
Compressiegieten
Uitharding in een autoclaaf

The manufacturing method should match the performance requirement.

Not every carbon fiber product needs an autoclave.

For many industrial, sports, outdoor, and commercial parts, other controlled processes may provide the required performance at a more reasonable cost.

The better question is not:

“Is autoclave the best process?”

It is:

“Which process provides the required quality and consistency for this product?”

Step 8: Trim and Finish the Carbon Fiber Part

After curing, the part is removed from the tooling.

Secondary finishing may include:

Flash removal
Edge trimming
Grinding
Schuren
Polishing
Matte finishing
Gloss finishing
Painting
Clear coating

For tubes, additional finishing may be needed to control:

Buitendiameter
Surface smoothness
Telescopic fit
Bonding areas

For telescopic products, functional fit is usually more important than appearance alone.

Step 9: CNC Machine Holes, Profiles, and Cutouts

Many carbon fiber parts require secondary machining after curing.

Typical operations include:

Cut-to-length
CNC profiling
Drilling
Slots
Cutouts
Verzinkboren

Examples include:

Drone frame plates
Robotic brackets
Equipment panels
Tube locking holes
Connector positions

Carbon fiber machining requires suitable tooling, dust control, part support, and attention to delamination.

Rather than repeating the complete machining process here, link internally to:

How to Cut, Drill, and Machine Carbon Fiber Sheets, Tubes, and Rods

Step 10: Add Metal Inserts and Connectors

Carbon fiber parts often need to connect to metal hardware.

Metal inserts may provide:

Threads
Bearing surfaces
Alignment
Replaceable hardware
Load-transfer points

Common materials include:

Aluminium
Stainless steel
Titanium

A reliable insert connection depends on:

Insert diameter
Bonding length
Adhesive gap
Surface preparation
Tube wall thickness
Load direction
Alignment

The connection should be designed before the final laminate is frozen.

A strong carbon fiber tube can still fail if the insert area is poorly designed.

Step 11: Inspect the Finished Part

Quality control should focus on the features that affect fit, function, and repeatability.

Dimensional inspection

Typical checks may include:

Lengte
OD
ID
Wanddikte
Plaatdikte
Diameter van het gat
Positie van het gat
Overall profile

Tube-specific inspection

For tubes and telescopic components:

Rechtheid
Ovality
Section fit
Sliding performance
Overlap
Locking function

Surface inspection

Visible parts may also be checked for:

Pinholes
Fiber distortion
Scratches
Resin-rich areas
Uneven finish

The acceptable cosmetic standard should be defined before production.

Machining inspection

Machined parts may require checks for:

Hole location
Diameter van het gat
Edge quality
Delamination
Countersink quality
Final cut length

Insert and assembly inspection

Assembled components may require inspection of:

Insert position
Alignment
Thread function
Bond line
Final assembly fit

The inspection plan should follow the drawing and application rather than using the same checklist for every product.

Prototype, Pilot Batch, and Mass Production

Custom carbon fiber development normally becomes more reliable when production is divided into stages.

Prototype

The prototype is used to confirm:

Dimensions
Pasvorm
Gewicht
Uiterlijk
Connection method
Basic function

The goal is to identify problems before production tooling and fixtures are finalized.

Pilot batch

For more complex projects, a small production batch can verify:

Repeatability
Machining fixtures
Assembly sequence
Inspection standards
Verpakking

Mass production

Once the sample and process are approved, the focus shifts to consistency.

Production control may include:

Fixed material specification
Controlled layup
Approved tooling
Standard machining program
Defined inspection criteria
Assembly fixtures
Packaging requirements

An OEM customer does not only need one good sample.

The next 100 or 1,000 parts should also match the approved part.

Why Samples Cost More Than Production Parts

Sample pricing often looks high compared with production pricing.

This is because prototypes may include:

Engineering review
Gereedschap
CNC programming
Setup
Fixtures
Manual processing
Process adjustment

These costs are spread across only a few parts.

During production, the same fixed costs are distributed across a larger quantity.

For a useful quote, buyers should provide both:

Sample quantity
Expected production quantity

Annual demand is also helpful.

This allows the supplier to recommend a process that works for both development and production.

Common Mistakes in Custom Carbon Fiber Projects

Choosing a process before defining the requirement

Starting with:

“I need an autoclave carbon fiber part.”

is often the wrong approach.

Start with:

Load
Geometry
Einde
Temperature
Aantal
Cost target

Then select the process.

Choosing carbon fiber only by grade

Specifying T700 does not fully define the component.

Performance also depends on:

Lay-up
Resin
Dikte
Geometry
Verspaning
Connections

Copying a metal component exactly

Carbon fiber often benefits from redesign.

A carbon fiber version may use:

Different wall thickness
Larger tube diameter
Local reinforcement
Bonded inserts
Different connection geometry

A direct metal-to-carbon copy may not use the material efficiently.

Adding holes too late

Holes can create stress concentrations.

Critical holes should be considered during the structural design stage.

Ignoring insert loads

A threaded insert may become the highest-loaded area of the part.

Insert design should not be treated as an afterthought.

Applying tight tolerance everywhere

Precision should be used where it affects function.

Unnecessary tolerance can increase machining and inspection cost.

Designing only for the prototype

A process that works for two handmade samples may become expensive at higher quantities.

Always consider repeat production.

What Should You Send for a Custom Carbon Fiber Quote?

The best quotation starts with clear project information.

Information	What to Provide
Producttype	Tube, sheet, plate, molded part, pole, or assembly
Drawing	PDF, STEP, DXF, or CAD
Dimensions	Overall size, OD, ID, thickness, hole locations
Current material	Steel, aluminum, plastic, or existing composite
Main load	Bending, torsion, compression, impact, vibration
Streefgewicht	Current and desired weight if relevant
Oppervlakteafwerking	Matte, glossy, woven, painted, cosmetic
Inserts	Material, thread, position
Environment	Indoor, outdoor, marine, heat, chemicals
Sample quantity	Initial prototype requirement
Productiehoeveelheid	First order quantity
Jaarlijkse vraag	Expected long-term volume

If a finished drawing is not available, a dimensioned sketch or product photo can still be used for the first review.

Best File Formats

File Format	Optimale toepassing
STEP / STP	3D molded components and assemblies
DXF	CNC-cut plates and 2D profiles
PDF drawing	Dimensions, tolerances, notes
CAD file	Detailed engineering definition
Photo	Existing product or reference part
Dimensioned sketch	Early-stage product concept

For production, a controlled drawing is preferable to relying only on email descriptions.

How LH Carbon Solutions Supports Custom Carbon Fiber Projects

LH Carbon Solutions manufactures custom carbon fiber tubes, sheets, rods, plates, telescopic components, and drawing-based composite parts for B2B applications.

Projects may begin with:

A finished drawing
An existing metal component
A physical sample
A product photo
A weight-reduction target
A new product concept

Depending on the project, available manufacturing and secondary processing may include:

Op maat gemaakte koolstofvezelbuizen
Koolstofvezelplaten en -vellen
Application-based layup
Prepreg processing
Vacuum processing
Molded components
CNC-snijden
Drilling
Bonded metal inserts
Threaded fittings
Surface finishing
Telescopic tube matching
Prototype production
Repeat OEM manufacturing

The manufacturing route should be selected around the product rather than forcing every component into the same process.

What We Need to Review Your Project

For an initial review, send:

Drawing, STEP, DXF, or product photo
Main dimensions
Toepassing
Current material
Main load or current problem
Vereisten inzake oppervlakte
Sample quantity
First production quantity
Estimated annual demand

If some information is not available yet, a sketch and basic dimensions are enough to begin the discussion.

FAQ About Custom Carbon Fiber Manufacturing

How are custom carbon fiber parts made?

The process normally includes drawing review, process selection, material and layup design, tooling, forming and curing, trimming, machining, assembly, and inspection.

The exact route depends on geometry, performance, and production quantity.

What is the best carbon fiber manufacturing process?

There is no single best process.

Pultrusion, roll wrapping, prepreg molding, vacuum processing, compression molding, filament winding, and CNC machining are suitable for different product types.

Does every carbon fiber part need an autoclave?

Nee.

Autoclave curing is suitable for certain high-performance applications, but many commercial CFRP parts can be manufactured using controlled oven, vacuum, press, or out-of-autoclave processes.

What is carbon fiber layup?

Layup describes how carbon fiber layers are arranged inside the component.

The number of layers and fiber directions are selected according to load, thickness, geometry, and performance requirements.

Do custom carbon fiber parts always need a mold?

Nee.

Complex 3D parts often require molds, while many flat CNC parts can be produced from carbon fiber laminate without dedicated 3D tooling.

Can carbon fiber be CNC machined after curing?

Ja.

Carbon fiber can be cut, drilled, routed, slotted, and countersunk after curing using suitable tooling and dust control.

Can metal inserts be bonded into carbon fiber?

Ja.

Metal inserts are commonly used for threads, bearings, connectors, and assembly points.

The insert geometry, bonding length, adhesive, and surrounding laminate should match the required load.

Should I make a prototype before production?

For most new custom components, a prototype or small validation batch is recommended to confirm dimensions, fit, appearance, assembly, and basic function.

Why are carbon fiber samples expensive?

Samples often include tooling, engineering, setup, CNC programming, fixtures, and manual processing costs that are spread across only a small number of parts.

What files should I send for a quote?

STEP files are useful for 3D parts, DXF for CNC-cut profiles, and PDF drawings for dimensions and tolerances.

A photo or dimensioned sketch can also be used for an initial review.

Afsluitende gedachten

Custom carbon fiber manufacturing is not simply a molding process.

The finished component depends on a chain of connected decisions:

Application → Geometry → Material → Layup → Process → Tooling → Curing → Machining → Assembly → Inspection

A high-grade carbon fiber cannot compensate for a poor layup.

A good laminate can still fail around a badly designed hole.

A strong tube can still have a weak insert connection.

And an expensive manufacturing process does not automatically create a better product.

The best approach is to begin with the finished component and work backward.

If you already have a drawing, send the STEP, DXF, or PDF together with the application and expected quantity.

If you are replacing steel, aluminum, or plastic, also provide the current material, weight, and the problem you want the carbon fiber version to solve.

That information makes it possible to choose a manufacturing process that works not only for the first sample—but also for repeat OEM production.

Custom Carbon Fiber Manufacturing Process at a Glance