Kinematic Heated Print Bed for Thermal Expansion Alignment
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Solution Overview
Problem
3D printers face issues with thermal expansion-induced deformations of the printer bed and workpiece, leading to alignment errors and oozing of print material, especially when using different materials and resolutions.
Innovation Solution
A doubly kinematic-coupled print bed system with aligned centroids for thermal expansion compensation, combined with a multi-resolution print head and anti-ooze mechanism, to maintain alignment and prevent oozing during printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a heated printer bed is used to enable printing with various materials, then material compatibility is improved, but thermal expansion causes alignment errors and deformation
Solution Approach 1:
The patent applies thermal expansion compensation mechanisms by designing the printer bed and support truss with kinematic couples that allow controlled expansion. The centroids of both the printer bed and support truss are aligned, and the kinematic couples are positioned to accommodate thermal expansion in opposite directions, thereby maintaining alignment accuracy despite temperature changes enabling diverse material printing.
2Manufacturing precision
If the printer bed is heated to prevent oozing, then print quality is improved, but thermal expansion induces deformation and alignment errors
Solution Approach 1:
The patent addresses bed deformation by aligning the centroids of the printer bed and support truss, and positioning kinematic couples to compensate for thermal expansion. This allows the heated bed to maintain its shape and alignment despite temperature-induced expansion, preventing oozing while avoiding deformation.
3Manufacturing precision
If thermal expansion compensation is implemented with aligned centroids and kinematic couples, then alignment accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent implements thermal expansion compensation through aligned centroids and strategically positioned kinematic couples. While this adds structural elements, the design integrates these components into the existing printer framework, using the alignment of centroids and opposite-direction expansion to achieve compensation without excessive complexity.
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 system effectively compensates for thermal expansion, ensuring precise printing across varying resolutions and materials, minimizing alignment errors and oozing, thereby enhancing print quality and efficiency.
Implementation Method 1
thermal expansion of the printer bed occurring at a different rate than thermal expansion of the support truss
Data Source
AI summary
Disclosed is a heated printer bed mounted to a kinematic coupling system that permits thermal expansion of both the bed and a support truss. One kinematic couple couples the bed to the support truss and a second kinematic couple couples the support truss to a frame of the printer. Both kinematic couples ensure that a common geometric center along each kinematic couple is maintained despite thermal expansion of the printer bed and the support truss occurring at different rates. The kinematic coupling system mitigates deformations to 3D-printed items from the effects of thermal expansion.