Robot arm 3D printing, also known as robotic 3D printing or robotic additive manufacturing, combines a 3D printer head that extrudes materials with a multi-axis robotic arm, resulting in a highly versatile 3D printer compared to traditional models.
The utilization of a robotic arm with its extensive range of movement makes it well-suited for large-scale projects. Furthermore, robotic arm 3D printing often eliminates the need for support, enhancing design freedom and reducing material costs. In this approach, self-supporting structures are necessary, which typically exclude overhanging designs.
However, manufacturers have found solutions to this limitation by enabling the reorientation of the building platform. This capability allows for the creation of overhangs by aligning the extrusion layer with the underlying geometry, effectively utilizing it as a support.
Robotic arm metal 3D printing offers numerous benefits and, in spite of that, it is important to be aware of its limitations. Understanding geometric restrictions, clearance impediments, and size constraints will pave the way for further advancements in this field.
By knowing these limitations, the users can make informed decisions and can navigate potential challenges more effectively when implementing robotic arm 3D printing.
1. Moving beyond the build plate
Standard 3-axis systems restrict part size and require heavy support structures. By integrating the Meltio Engine with industrial robot arms—such as KUKA, ABB, or Fanuc—manufacturers gain 6 degrees of freedom. This allows the deposition head to tilt and extrude material from any angle.
The result? You can print meter-scale components, repair existing parts, or add features to standard CNC blanks without inherent size constraints.
2. Benefits of robotic arm metal 3D printing
When it comes to robotic arm metal 3D printing, the possibilities for creating intricate and complex geometries are truly remarkable. The technology offers a unique advantage by allowing precise control over toolpath trajectories, which can be adapted to meet the specific requirements of the geometry being printed.
The robotic arm used for metal 3D printing, with its six degrees of freedom (DOF) that can be coupled with the potential addition of two external axes, provides an extensive range of slicing solutions for a given part.
- The versatility of robotic arm 3D printing lies in its ability to maneuver the deposition head in a way that traditional 3D printers cannot. By leveraging the extra degrees of freedom, the printer can effectively navigate around obstacles, overhangs, and intricate features with enhanced precision. This capability opens up new possibilities for designing challenging and organic shapes that were previously difficult to manufacture using conventional methods.
- Moreover, the ability to control the orientation and angle of the deposition head allows for optimized layer deposition and improved structural integrity. This feature enables the printer system to create overhangs and unsupported structures more effectively, reducing the need for excessive support structures and minimizing material waste.
- By intelligently adjusting the toolpath trajectories to suit the geometry, the robotic arm 3D printer can produce parts with greater accuracy, intricacy, and strength.
The potential integration of external axes further expands the capabilities of robotic arm metal 3D printing. These additional axes can be utilized for specialized functions, such as rotating the part during the printing or interpolating an external arm to keep the deposition head printing vertically, taking advantage of the gravity that favors the attachment of the deposited material and the previous layer.
This flexibility empowers designers and engineers to explore innovative slicing strategies and printing techniques to achieve the desired results for their specific applications.
“A customer needed a spare part urgently, and could not find it in stock at any of its suppliers. These suppliers did not have the parts manufactured and the delivery time was 8-10 weeks.
The printing was done by enlarging the part by 1mm. in order to be able to carry out a machining post-processing. From the delivery of the drawing to the shipment of the part 72 hours.”
3. The software bridge: Meltio Space
Hardware is only as good as the software driving it. Meltio Space is the dedicated toolpath slicer that bridges your CAD model and the robot’s kinematics. It calculates the complex non-planar trajectories required for 6-axis printing, meaning you don’t need to be a robotic programming expert to start printing metal.
TIP: Learn how 5-axis toolpaths unlock complex metal geometries.
4. Robotic arm metal 3D printing limitations
Robotic arm metal 3D printing is renowned for its adaptability and versatility, enabling the creation of a vast array of parts. However, like any manufacturing process, it is essential to recognize the limitations that come with it. There are specific considerations and challenges associated with this technology that will be explained hereinafter.
In the following topics, a review of the geometrical limitations of the part to be printed is provided with detailed guidelines and recommendations to ensure successful prints within these limitations.
It also emphasizes the boundaries derived from the equipment dimensions, informing how to avoid collisions between the deposition head and the printed object, with valuable insights on optimizing tool paths to mitigate the risk of damage.
Furthermore, it addresses the constraints of the printing volume within the Meltio system, enabling users to optimize their designs and efficiently utilize the available space.
5. Understanding the constraints
The Meltio Design Guidelines provide an overview of the existing constraints associated with laser wire deposition technology. These limitations outline the specific aspects that warrant attention and consideration.
TIP: To delve deeper into this aspect, check Meltio Design Guidelines Whitepaper.
6. Overhangs / Support adaptations
One of the key advantages of robotic arm metal 3D printing is its ability to minimize the use of supports due to its increased degrees of freedom. This allows for the generation of toolpaths that can be adapted to complex geometries. Nonetheless, there are situations where it becomes necessary to evaluate the use of supports or modify the toolpath to accommodate such complicated designs.
In some cases, incorporating a small amount of additional material that can be easily machined afterward may prove more advantageous than attempting to adapt the toolpath to highly complex geometries. This approach prevents potential instability issues that may arise if the process parameters are not meticulously defined. By strategically introducing supplementary material that can be later removed, the overall printing process can be optimized for stability and efficiency.
It is important to note that the decision to add support depends on the chosen toolpath generation strategy. Regardless of the strategy employed, all supports must be implemented by offsetting the surface during the slicing process, with the exception of pipes or revolved surfaces.
7. Printing volume
When it comes to the printing volume, the only constraint is the working range of the robotic arm. Meltio’s deposition head is a versatile and independent tool that seamlessly integrates with a diverse range of robot brands. This integration ensures that the robot arm itself becomes the sole determinant of the printing volume, eliminating any additional limitations in terms of size
TIP: Discover the Meltio Engine Integration kit for Robot, the perfect platform for large and complex 3D printing, repair, cladding, and feature addition.