If you’re accustomed to traditional Cartesian 3D printing, there’s an innovative development to consider: Joshua Bird has designed a 4-axis 3D printer that breaks away from conventional designs. This unique printer features a rotary platform as its build plate, augmented by a linear rail and lead screw that functions as the Z-axis.
What truly sets this printer apart is its "Core R-Theta" mechanism. This setup utilizes two stepper motors and a continuous timing belt, characteristic of a CoreXY motion system, to enable motion across two axes. However, instead of moving on two linear paths, these motors coordinate to shift the entire print arm inwards or outwards along the circular platform while also allowing the print head to rotate nearly 90 degrees.
The potential for this configuration is fascinating. When the print head is positioned vertically to the bed, it operates similarly to a polar printer. Yet, when tilted, it can produce steep overhangs without requiring additional supports. Joshua demonstrated this capability by printing a simple propeller, where the hub was printed in a traditional manner while the blades were formed at increasingly steeper angles.
This novel slicing process presents some challenges, especially regarding print cooling, which Joshua effectively manages by directing compressed air onto the print area. For a closer look at this innovative printing method, check out the demonstration video linked below.
This project is a remarkable achievement that showcases Joshua’s dedication to overcoming complex challenges in 3D printing, marking a significant update in the field.