Resiliently Suspended 3D Printer Head for Uneven Surfaces
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Solution Overview
Problem
Current FFF 3D printing technologies face challenges in achieving predictable layer thickness and width with a smooth, homogeneous surface due to rigidly mounted printer heads that cannot adapt to uneven underlying materials, leading to poor surface finish and adherence issues.
Innovation Solution
A printer unit with a resiliently suspended nozzle that allows vertical movement, biased by the printing material's force, to maintain a consistent distance from the underlying material, ensuring smooth and homogeneous layer deposition even on irregular surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigidly mounted printer head is used, then the structural stability is improved, but the manufacturing precision deteriorates due to inability to adapt to uneven underlying materials
Solution Approach 1:
The printer head is transformed from a rigid, fixed structure to a dynamic, movable one through the introduction of a resilient means (spring) that allows vertical movement. This enables the printer head to adapt its position to uneven underlying materials while maintaining structural stability through the spring's support, thereby resolving the contradiction between stability and precision.
Solution Approach 2:
The vertical position of the printer head is changed from a fixed parameter to a variable parameter that can adjust in response to the underlying material's topography. The spring mechanism allows the head's vertical coordinate to change dynamically, enabling precise layer deposition despite surface irregularities.
2Device complexity
If a rigidly mounted printer head is used, then the device complexity is reduced, but the surface finish quality deteriorates
Solution Approach 1:
A spring-based resilient means is introduced to create a dynamically adjustable mounting structure. This relatively simple mechanical element enables the printer head to follow the contours of the underlying material, significantly improving surface finish quality without adding complex control systems or multiple components.
3Adaptability or versatility
If an articulable robotic arm is used, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The complex articulable robotic arm system is replaced by extracting only the essential function needed: vertical position adjustment. A simple spring mechanism is used to provide this single-degree-of-freedom adjustment, achieving adaptability to uneven surfaces without the complexity of multi-axis robotic control systems.
Solution Approach 2:
Instead of using a complex robotic arm with multiple adjustable parameters (angles, positions, orientations), the solution changes only the vertical position parameter through a simple spring mechanism. This minimal parameter change approach achieves the necessary adaptability while keeping the device simple.
4Manufacturing precision
If a resiliently suspended printer head is used, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The spring-based resilient means provides self-service by automatically adjusting the printer head's vertical position in response to uneven underlying materials. The spring naturally compresses or extends to maintain contact, eliminating the need for external sensors, actuators, or control systems, thus achieving precision without significant complexity increase.
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 solution enables improved surface finish and adherence by allowing the nozzle to follow the undulations of the underlying material, maintaining consistent layer thickness and width, and adapting to different materials and topographies, resulting in a more reliable and versatile 3D printing process.
Implementation Method 1
The printer head is resiliently suspended in the printer unit in a vertical direction by at least one resilient means, allowing a vertical movement of the printer head during deposition of the printing material
Implementation Method 2
The at least one resilient means is configured to become biased by a vertical force on the nozzle from the printing material on the underlying material
Data Source
AI summary
A printer unit (100) for a 3D-printing apparatus for deposition of a printing material, as well as a method of 3D printing, is provided. The printer unit comprises a printer head (105) comprising a nozzle (110). The printer head is resiliently suspended in the printer unit in a vertical direction by at least one resilient means (120), allowing a vertical movement of the printer head during deposition of the printing material. The suspended printer head in its equilibrium is positionable above the underlying material at a vertical distance (Δz1) before deposition. During deposition of printing material, the at least one resilient means is configured to become biased by a vertical force (F3) on the nozzle from the printing material on the underlying material, such that the printer head moves from its equilibrium into a position at a desired vertical distance (Δz1) from the underlying material.