Modular 3D Printing System with Bowden Extrusion and Base Station
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Solution Overview
Problem
Existing handheld 3D printing systems, or 3D Pens, are bulky, inflexible, and suffer from design challenges such as thermal control and motor packaging due to the integration of all sub-systems within the pen body, limiting user experience and options for improvement.
Innovation Solution
A modular 3D printing system comprising a base station with a Bowden style mechanism and a handheld drawing device, where the base station houses the extrusion mechanism, motor, and electronics, while the handheld device focuses on filament transfer and actuation, allowing for improved thermal control and user interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all sub-systems (extrusion mechanism, motor control, electronics, hotend) are contained within the 3D Pen body, then the device is self-contained and portable, but the device becomes large, bulky and unwieldy
Solution Approach 1:
The system is divided into two main segments: a base station housing the extrusion mechanism, motor, and electronics, and a separate handheld drawing device containing only the heated section and nozzle. This segmentation allows the bulk of the system to remain stationary while the drawing device stays portable and manageable in size.
Solution Approach 2:
The heavy sub-systems (extrusion mechanism, motor, electronics) are extracted from the handheld device and placed in the base station. Only the essential heated section and nozzle remain in the drawing device, significantly reducing its size and weight while maintaining portability.
2Ease of manufacture
If all sub-systems are contained within the pen body, then the device is integrated, but design challenges arise in thermal control of the hotend and motor packaging
Solution Approach 1:
Separating the thermal management requirements by placing the heated section in the handheld device while keeping the motor and electronics in the base station allows independent optimization of thermal control without compromising motor packaging space.
Solution Approach 2:
Extracting the motor and electronics from the handheld device eliminates thermal interference and packaging constraints, allowing the heated section to be designed solely for thermal efficiency without accommodating other heat-generating components.
3Volume of moving object
If the user interface and control methods are fit within the pen body, then the device is compact, but the user experience suffers and options for improvement are limited
Solution Approach 1:
The user interface and control systems are extracted from the handheld device and relocated to the base station, allowing for a full-featured interface with display screens, buttons, and controls that would be too bulky for the pen body, thereby enhancing user experience without compromising device portability.
4Volume of moving object
If a very small DC motor is used to fit size constraints, then the motor fits in the device, but torque output is limited and complicated gearboxes are required
Solution Approach 1:
The motor is extracted from the handheld device and placed in the base station, freeing it from size constraints. This allows the use of larger, higher-torque motors without requiring complicated gearboxes, as the motor can be optimally sized for the extrusion mechanism's torque requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modular design enhances the flexibility and usability of the 3D printing system, reducing bulkiness and improving user control, while allowing for accessory integration and expanded functionality.
Implementation Method 1
cause the heated section to at least partially melt the filament moving through the drawing device
Data Source
AI summary
A system for operating handheld three-dimensional filament extrusion device is provided. The system includes a housing with an inlet and an outlet. A Bowden style mechanism is coupled to the housing and has a motor coupled to a filament engagement mechanism. A filament holder is coupled to the housing and transfers the filament to the Bowden style mechanism. A 3D drawing device defines a pathway that receives filament from the outlet and transfers the filament to a heated section. The drawing device includes a nozzle coupled to the heated section and an actuator. A controller having a processor is responsive to an actuation of the at least one actuator for causing the motor to rotate in a first direction to move the filament through the inlet and outlet to the drawing device and to cause the heated section to at least partially melt the filament moving through the drawing device.