Using high end 3d printer to print RC car gears (Polyjet)

PolyJet is a 3D printing technology that uses a process similar to inkjet printing to create three-dimensional objects. It is one of the popular additive manufacturing techniques used for producing highly detailed and precise models, prototypes, and functional parts.

Here’s an overview of the PolyJet 3D printing technology:

Principle and Printing Process:
PolyJet technology utilizes a liquid photopolymer resin as the printing material. These resins are stored in cartridges and jetted through print heads, much like inkjet printers.
The printer deposits thin layers of liquid photopolymer onto the build platform. Each layer is cured (solidified) instantly using UV light as it is deposited.
After a layer is cured, the build platform descends slightly, and the process repeats, layer by layer, until the complete 3D object is built.

Multiple Materials and Colors:
One of the significant advantages of PolyJet technology is its ability to print with multiple materials simultaneously. Different print heads can deposit different materials during the same print job.
This capability allows for the creation of multi-material parts, which can have varying properties such as rigid, flexible, transparent, and colored sections in a single print.

High Precision and Detail:
PolyJet is known for its high level of precision and detail. It can achieve layer thicknesses as low as 16 microns (0.016mm), resulting in smooth surfaces and fine feature resolution.
The ability to print in multiple colors and materials further enhances the level of detail and realism that can be achieved.

Support Material:
PolyJet printers also use a support material during the printing process. This support material is necessary for printing overhangs and complex geometries that might otherwise collapse during printing.
The support material is usually a gel-like substance that can be easily removed after the print is completed.

Applications:
PolyJet technology finds applications in various industries, including product design, automotive, aerospace, medical, and consumer goods.
It is commonly used for creating concept models, functional prototypes, architectural models, medical devices, and even artistic pieces.

Post-Processing:
Once the printing is complete, the printed object may require post-processing, such as removing support material, cleaning, and potentially applying additional finishing steps, like painting or polishing.

PolyJet 3D printing is a versatile and precise technology that offers a wide range of applications. However, it’s essential to note that the specifics of the process may vary depending on the manufacturer and model of the PolyJet printer being used.

Using higher end printers such as the J55 (https://www.stratasys.com/en/3d-printers/printer-catalog/polyjet/j55-prime/) to print gears with resin can deliver much better results (much finer surface finish and much more accurate dimensions).

 

PolyJet 3D printing technology uses a specific type of photopolymer resin as its primary printing material. The resin is a crucial component of the PolyJet process, as it determines the material properties, color, and characteristics of the printed objects. Here are some key features and properties of the resins used in PolyJet 3D printing:

Photopolymer Resin:
Photopolymer resins are a type of liquid polymer that cures (hardens) when exposed to ultraviolet (UV) light. In the context of PolyJet, the resin is a photosensitive material that solidifies rapidly when exposed to UV light during the printing process.

PolyJet technology offers a wide range of photopolymer resins to choose from. Each type of resin has its unique properties, such as mechanical strength, flexibility, transparency, heat resistance, and more.
Some common materials available in PolyJet 3D printing include rigid plastics, rubber-like materials, transparent resins, and even specialty materials like biocompatible or dental-grade resins.

Photopolymer resins used in PolyJet printing are available in a wide range of colors. This allows for the creation of colorful and visually appealing 3D printed models without the need for additional painting or coloring steps.

PolyJet resins used for support material are designed to be easily removable after the printing process. Support material is necessary to print overhangs and complex geometries accurately. The support material is typically a gel-like substance that can be dissolved or mechanically removed, leaving the final 3D printed object with minimal post-processing requirements.

After the printing process, the 3D printed object may undergo post-curing. This additional step involves exposing the printed part to additional UV light to ensure that the resin is fully cured and reaches its optimal material properties.

 

The support at the bottom is mandatory…. soft but a bit sticky.

Post processing other than support removal is not necessary.

Author: ycthk