FDM Overhang Printing With Vertical Supportless Layer Deposition
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Solution Overview
Problem
Existing 3D printing methods using FDM struggle to create objects with angles less than 45° relative to the building plate, requiring support structures that increase printing time and can lead to defects, while inclined layer printing is not suitable for thin-walled objects.
Innovation Solution
A method combining horizontal and vertical printing techniques, allowing layers to be deposited at angles less than 45° without support, using a partially blocked nozzle to create overlapping layers that adhere to previous layers, forming a 'metal pea whistle' shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If objects are printed with inclination angles less than 45° with respect to the building plate, then the structural integrity and adhesion of the object are improved, but the object cannot be released from the building plate without breaking or deforming
Solution Approach 1:
The patent applies dynamics by making the building plate movable rather than fixed. The building plate is configured to move between a first position during printing and a second position for release, allowing the system to adapt its configuration based on the operational phase. This dynamic repositioning enables the plate to maintain strong adhesion during printing while facilitating easy object release afterward.
Solution Approach 2:
The patent introduces a spatial dimension solution by tilting the building plate at a specific angle (α) relative to the horizontal plane. This angular orientation creates favorable stress distribution and adhesion conditions for objects printed at low inclination angles. The dimensional change in plate orientation enables both strong bonding during printing and facilitated release by altering the gravitational and adhesive force vectors.
2Manufacturing precision
If objects are printed layer by layer from bottom to top, then manufacturing precision is maintained, but productivity is reduced due to repeated heating and cooling cycles
Solution Approach 1:
The patent applies preliminary action by pre-heating the building plate to the melting temperature of the filament material before printing begins. This preliminary heating eliminates the need for repeated heating cycles during layer deposition, as the plate maintains optimal temperature throughout the printing process. The preparatory thermal conditioning enables continuous printing without thermal cycling interruptions.
Solution Approach 2:
The patent implements continuity of useful action by maintaining the building plate at a constant elevated temperature throughout the entire printing process. This continuous thermal state allows uninterrupted material deposition and bonding, eliminating the stop-start nature of repeated heating and cooling cycles. The sustained thermal environment enables continuous productive operation while maintaining printing precision.
3Manufacturing precision
If the building plate is heated to melting temperature of the filament material, then adhesion of the first layer to the building plate is improved, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-heating the building plate to the melting temperature of the filament material before printing begins. This single preliminary heating action ensures optimal adhesion for the first layer and subsequent layers, eliminating the need for repeated heating cycles. The energy investment is made once at the start rather than continuously throughout the printing process.
Solution Approach 2:
The patent maintains the building plate at a constant elevated temperature throughout the printing process, creating a continuous thermal state that sustains optimal adhesion conditions. This continuous thermal maintenance requires less total energy than repeated heating and cooling cycles, as it avoids the energy losses associated with thermal cycling and allows uninterrupted printing operations.
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
Enables the creation of 3D printed structures with any angle relative to the substrate, including large overhangs, without the need for support structures, improving printing efficiency and reducing defects.
Implementation Method 1
heating the building plate to a melting temperature of the filament material
Implementation Method 2
cooling the extruded filament material to the solid state in an extrusion direction
Data Source
Figure 1A~1B
Figure 1C~2A
Figure 2B~2C
AI summary
Method for producing a 3D item (1) by means of fused deposition modelling, the method comprising a 3D printing stage comprising layer-wise depositing an extrudate (321) comprising 3D printable material (201), to provide the 3D item (1) comprising 3D printed material (202), wherein the 3D item (1) comprises a plurality of layers (322) of 3D printed material (202), wherein the 3D printing stage comprises: • - a vertical support providing stage comprising providing a first layer (1100) of 3D printed material (202), wherein the first layer (1100) has a first layer top part (1110) with a first layer top height (HI 1) relative to the substrate (1550) and a first layer bottom part (1120) with a first layer bottom height (H12) relative to the substrate (1550), wherein the first layer (1100) has a first layer height (HI) defined by the difference between the first layer top height (HI 1) and the first layer bottom height (H12), wherein the value of the first layer bottom height (H12) is at least equal to the value of the first layer height (HI), and • - an in-air printing stage comprising supportless depositing a second layer (1200) of 3D printed material (202) adjacent to and in contact with the first layer (1100), wherein the second layer (1200) has a second layer top part (1210), wherein at least part of the second layer top part (1210) extends over at least part of the first layer top part (1100) and is conformal therewith.