3D Printing Material: CarbonMide

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Overview

Here you will find all the information, tricks, know-how, and advice to help you print your 3D model in our CarbonMide material. You will learn about the:

General information & Printing Techniques

Our CarbonMide Material

The CarbonMide objects printed at Sculpteo are created from a fine black plastic polyamide powder (PA12) reinforced with carbon-fibers. The material is characterized by an excellent stiffness and a maximized weight-strength-ratio. It nearly has the same mechanical properties than the solid black plastic Polyamide but is much more lightweight. The material is great for experienced professionals and people in need of a strong and lightweight material, and a very high 3D printing precision.

Due to the process related orientation of the fibers, the mechanical properties vary in the three axis directions. The Z axis is is the less resistant compared to X and Y. To learn more about it, refer to the design guidelines.  

To learn more, refer to our paragraph about finishes and colors for polyamide models.

Processing Times and Pricing

The printing price of your design is calculated automatically the moment it is placed online. As you modify your object (changing size, using batch control or hollowing feature, etc.) you will note that the price changes automatically. The pricing is based on a series of factors, including: total volume, object size, and bounding box - to name a few.

Your CarbonMide object is estimated to arrive in maximum 16 business days. Polishing options and particularly large objects can extend the processing time by 1-2 days on average. The estimated shipping time is also calculated automatically as the object is uploaded.

Delivery time should be added to processing time and depends on the delivery option you choose.

Printing techniques

Sculpteo uses a process called Selective Laser Sintering (SLS) for all polyamide plastic prints. It is this process which is used to print our CarbonMide. After your design is uploaded to the Sculpteo website, it undergoes a couple of steps before it is physically created:

  • Model transferred to 3D printer
  • Once you upload your 3D model to our website, it is received by a Sculpteo team member, who expertly places the model into the next available batch. The specific printer from which it will be printed is determined mainly by the dimensions of your object or batch, the larger prints being reserved for the larger printers. For CarbonMide, we use the EOS Formiga P396.

  • Object is 3D printed
  • SLS uses a highly specific laser that sinters thin layers of reinforced black polyamide powder together one layer at a time. After each round of lasering, the printing bed is lowered and another layer of powder is evenly swept across the top for another round of sintering. This process is repeated at a layer height of 100 µm until the object is completed.

  • Removal from Batch
  • After the printer cools, the block of sintered black powder is removed from printer and the printed objects are removed by hand. A part of the powder that was not sintered is recycled back into the printer for a future print.

  • Brushing and Sandblasting
  • The object is then brushed, which removes a large portion of the black powder, and sandblasted, which removes the fine black powder that the brush may have missed. 

  • Polishing
  • From there the object can be polished. Our polishing technique involves small stones in a rotating/vibrating cauldron - as the stones brush up against the object, small imperfections in the surface are smoothed. To learn more, refer the paragraph on finishes for CarbonMide models.

Uses and Maintenance

CarbonMide is very similar to 3D printed polyamide as it is flexible, has a high impact resistance and is stable to every weather. The additional  value of the CarbonMide is its lightweight. Carbon filled materials are great for parts that require high resistance and lightweight. Many applications can fit the material capacities: mechanical (prototypes, geared systems, articulated objects, etc.),  electrical, medical, ornamental, or even educational parts. CarbonMide parts are often used for aerodynamic components in motor sports applications. 

Technical properties of CarbonMide change depending on the thickness of your model. With a 0.8 mm wall thickness, your model will be flexible. With a 2 mm wall thickness, it will be rigid. Please check our polyamide blog post on elastic modulus measurements for more information on flexibility.

With regards to water qualities, CarbonMide is water-resistant but not waterproof. Thus the 3D object must not stay in contact with water for extended periods of time. In terms of temperature, if the plastic is subjected to heat above 176°C, it is possible that the physical form of the object can be significantly altered. CarbonMide has an increased electrical conductivity compared to other polyamide materials. 

Furthermore, CarbonMide has an excellent resistance to chemicals, especially hydrocarbons, aldehydes, ketones, mineral bases and salts, alcohols, fuels, detergents, oils and fats.

The somewhat rough surface of the CarbonMide objects can attract dirt. This can often be remedied with soapy water and a cloth, letting it dry thoroughly. The objects are coloured throughout their whole volume, which makes them well suited against scratches and abrasion.

Finishes

Finishing Options

CarbonMideRAW.jpg CarbonMidePOLISHED.jpg

There are multiple finishing options available through Sculpteo.

Finishing options available for CarbonMide:

  • Raw: sandblasted but unpolished, surface remains somewhat rough, most economical.
  • Polished: polished through mechanical polishing, smoother to touch, layers still somewhat visible on rounded objects.

Your CarbonMide part is made from a black polyamide powder reinforced with carbon-fibers. This black polyamide powder is a mass-colored black polyamide 12 powder, which is optimized for the use as a laser sintering material. As a result, the part is coloured throughout its whole volume. 

Paint and glue your polyamide parts


Polyamid object to show that you can paint and glue differents

It is also possible to arrive at finer levels of finishing at home with various DIY techniques. To learn more, you can refer to our tutorial about gluing and painting polyamide models.

Design Guidelines

Printing Resolution

Layer Thickness 150 µm
Accuracy ± 0.5% (with a limit of ± 0.5 mm)


Orientation of CarbonMide Objects

Due to the process related orientation of the fibers, the mechanical properties varies in the three axis directions. The Z axis is the least resistant compared to X and Y. 

If you are an Expert User, be sure to orientate your model thanks to the customized orientation option regarding the stress and loads on your part. 

In the case you don't have access to the customized orientation option, you can contact our sales team to indicate how your part needs to be printed. 

To learn more about the customized orientation option, you can check this blogpost

Size Limitations

Maximum size unpolished 600 X 335 X 335 mm
Maximum size polished 180 X 150 X 150 mm


BoundingBoxCarbonRaw.pngBoundingBoxCarbonPolished.png

The maximum size of your model is limited by the physical size of our 3D printers - nothing can be printed larger than the printer bed. The same goes for our polishing tanks - if it doesn’t fit, it can’t be used.

There is no minimum size for CarbonMide prints, keeping in mind minimum thickness for walls and structural aspects, to ensure the object will not break is 0.8 mm.

Minimum Thickness and Geometry of Your 3D Model

Minimum wall thickness (flexible) 2.5 mm
Minimum wall thickness (rigid) 2.5 mm
Minimum wall thickness stemmed elements 0.8 mm with support
1 mm without support
Minimum wall thickness particular design aspects 1-2 mm

Wallthickness25mm.jpg

The walls of your design must adhere to a minimum thickness of 1.5 mm in order to guarantee the structure will not break. If the walls of your model are less than 1.5 mm, you can add a support structure to maintain stability.

A stemmed element is a design aspect which is at least twice as long as it is thick. For unsupported and stemmed elements or parts of the design with a particular design constraint, it is also important to respect a minimum thickness of 1 mm in order to guarantee the object will not break.

Tips
Icon to show that you can ad a support structure to maintain stability

Add a support structure to maintain stability. For example, if you are modelling a bust of a person, you can attach thin aspects of the design like the ears in more places around the model’s head. Doing that will avoid cantilevered and easily breakable elements in the final print.



With a 1.5 wall thickness, your design will be slightly flexible. To obtain more rigidity, we advise you to choose a 2.5 mm wall thickness.

Good to know

Thin walls supporting large, heavy plastic models can warp under the weight of itself.



Sculpteo offers an online solidity check tool which highlights parts of the print that may be too thin for a print. From there you are able to tweak your design in order to create an object that is an appropriate thickness. To use it, you just need to upload your 3D file, select your material and clic on “Verification” tab.

It is also important to keep in mind that the object is to be printed into real life. Thus if a thin aspect is supporting something that is too heavy for it, it may break - even though it is possible within the physics provided by your 3D modeling software. We recommend adding a bit of thickness to the places that will get a lot of handling, or that support the most weight.

Do not forget
Icon to keep in mind that solidity check tool don't detect physical aberrations

Keep in mind that our solidity check tool does not detect physical aberrations such as floating parts, unstable position, parts supporting too much weight relative to its thickness, etc. Particular care must be given to the geometry of your design and the most stressed parts must be thickened.


Etching/Embossing Depths

Minimum size of details 0.3 mm
Minimum height and width details Embossed : 0.4 mm
Engraved : 0.5 mm
Minimum height and width for a readable text 0.5 mm
Enlargement ratio 1/1

Diagram to show the etching and embossing depths

A detail’s minimum precision is mainly determined by the resolution of our 3D printers. However, during the cleaning process, a fine layer of detail can also be lost. In order for a detail and text to be visible we recommend following our recommended sizes at the very least.

It’s possible that particularly fine embossings and engravings will not be visible, as the carving could get filled with excess powder that is later unable to be cleaned out. If an embossing or engraving is an essential part of your design we recommend making them as deep as possible. To ensure a better powder removal (thus a better detail visibility), the width of your details must be at least as big as depth.


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Enclosed and Interlocking Volumes

Enclosed parts ? Yes
Interlocking parts ? Yes

PA details

Our CarbonMide material has the ability to print the most complex designs of our materials. An example of a complex design is a volume enclosed within another volume, like a chain or maraca. Our 3D printers have the ability to 3D print a fully interlocked chain our of the printer, with no support structures to remove.

Minimum Spacing and Clearances

Minimum spacing between fixed walls 0.5 mm
Minimum clearance between parts 0.5 mm

Diagram to show the minimum spacing and clearance need to a 3D print

For a successful 3D print a minimum clearance between objects is required to allow excess material to be sand blown out. If this space is not left within the design, the object will be a solid. This is particularly important for articulated objects - as the space left between the walls will define the object’s ability to move.

Clearance should be at least 0.5 mm and depends on your objects size. For big sizes, the clearance should be greater. The heated zone of your object depends on the size, the larger the object the more time it will be exposed to high temperature: if the space left between the walls is too small, it will be weld because of heat spreading. In some cases, holes should be added to allow us to drain for the excess powder material within the clearance.

Do not forget

Clearance should be at least 0.5 mm, however that is the minumum for small objects. Larger objects require more space between their parts. This is due to the SLS printing process. Our printer beds are heated during the process, and larger objects are heated for longer periods. A small space between large objects runs the risk of melting together as it remains under heat for a long period of time. In some other cases, holes should be added to allow us to drain for the excess powder material within the clearance.


Piece Assembly Restrictions

Assembly ? Yes
Minimum space 0.5 mm

PA details

Objects printed in CarbonMide can be printed to be assembled, as long as a width of at least 0.5 mm is left between the different parts of the object.

Hollowing

Hollowing ? Yes

Diagram to optimize the hollowing

Our online hollowing optimization tool has the ability to greatly reduce the price of a print by reducing the amount of material used.

Using the tool requires adding two holes to your model, which will serve as the drain for the excess powder material within the object. The minimum size of these holes is determined by our website. Thickness of the hole will also be considered. Otherwise it is possible to hollow your object manually in your 3D modeling software.               

Files with multiple objects

Files with Multiple Objects ? No

Icon to show that you can't print a 3D file containing several objects

It is not possible to 3D print a 3D file containing several objects with our 3D plastic printers.

Technical specifications

Mechanical Properties Conditions Unit Value
Density of laser-sintered part EOS-Method Kg/cm3 1040
Tensile Modulus X Direction ISO 527-1/-2 Mpa 6100
Tensile Modulus Y Direction ISO 527-1/-2 Mpa 3400
Tensile Modulus Z Direction ISO 527-1/-2 Mpa 2200
Tensile strength X Direction ISO 527-1/-2 N/mm2 72
Tensile strength Y Direction ISO 527-1/-2 N/mm2 56
Tensile strength Z Direction ISO 527-1/-2 N/mm2 25
Melting point ISO 11357-1/-3 °C 176

For more information about black plastic's specifications, please refer to the following document:



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