The main objective of this stage was to create a mechanism capable of flexing the print bed automatically after a print is completed, allowing the printed object to detach without manual intervention.
To achieve this, we are integrating a linear actuator into the mechanical structure of the 3D printer using custom 3D-printed parts that we are currently developing. The actuator is responsible for generating the controlled movement required to flex the print surface safely and consistently.
Electronic Control
To control the actuator’s movement, we implemented an H-Bridge driver circuit connected to the Raspberry Pi 5.
The H-Bridge allows the Raspberry Pi to:
- Control the direction of the actuator movement
- Extend and retract the actuator as needed
- Interface safely between the low-power GPIO pins and the actuator power requirements
Raspberry Pi 5 Integration
The actuator control system was fully integrated with the Raspberry Pi 5, which acts as the central controller of the AutoPrint prototype.
Using Python, we developed control scripts capable of:
- Activating the actuator automatically
- Controlling extension and retraction timing
- Managing GPIO communication with the H-Bridge
- Preparing the system for integration with the complete automated print workflow
Next Steps
The next stage of development will focus on completing the mechanical integration of the linear actuator into the 3D printer structure.
We are currently finishing the remaining custom 3D-printed mounting parts that will securely attach the actuator to the printer frame. These components are essential to ensure proper alignment, stability and reliable bed flexion during operation.
After the mechanical assembly is completed, we will move on to tuning and optimizing the actuator control code. This process will involve adjusting movement timing, extension limits and synchronization with the printing workflow to achieve smooth and consistent operation.
Conclusion
The development of the linear actuator control system represents an important milestone in the AutoPrint project.
By successfully integrating the H-Bridge driver with the Raspberry Pi 5 and developing Python-based control scripts, we established the foundation for automated print bed flexion and part removal.
Although the mechanical integration is still in progress, the system is already capable of controlling the actuator electronically, validating a key aspect of the project architecture. The next steps will focus on finalizing the physical mounting system and refining the actuator behavior to ensure reliable and efficient operation within the complete AutoPrint system.