3D Printing Surface Graphics With Seamless Dual-Extruder Toolpaths
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Solution Overview
Problem
Existing 3D printing technologies face challenges in efficiently and smoothly transitioning between extruders, leading to delays, voids, and unwanted material extrusions, particularly when rendering intricate patterns or graphics, which complicates the creation of high-resolution, multi-colored objects.
Innovation Solution
A method involving a serpentine deposition pattern where one extrudate is deposited along the surface and the other is submerged beneath, with both extrudates crossing at the same Z-height to ensure seamless integration and minimal extruder changes, allowing for fine patterns and graphics on the object surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional extruder switching is used to render multi-colored objects with intricate patterns, then color variety and pattern complexity are improved, but build time increases and material defects (voids, strings) occur due to frequent extruder transitions
Solution Approach 1:
The patent applies preliminary action by preparing both extruders in advance and positioning them at the same Z-height before deposition begins. This allows seamless switching between extruders without vertical movement delays, as both nozzles are pre-positioned and ready to deposit material continuously at the same level.
Solution Approach 2:
The patent implements continuity of useful action by maintaining both extruders in an active, ready-to-deposit state throughout the printing process. Rather than retracting and repositioning extruders between uses, both remain engaged at the same Z-height, eliminating idle time and ensuring continuous material deposition without interruptions.
2Manufacturing precision
If frequent extruder transitions are made to create intricate patterns, then pattern detail is improved, but material defects (voids, strings, unwanted extrusions) increase
Solution Approach 1:
Both extruders are pre-positioned at the same Z-height and kept in a ready state before deposition begins. This preliminary positioning eliminates the need for vertical movement during extruder switching, preventing voids and material defects that would otherwise occur during repositioning.
Solution Approach 2:
Both extruders remain continuously active and positioned at the same Z-height throughout the printing process. This continuous readiness prevents material defects by eliminating retraction and repositioning cycles that create voids, strings, and unwanted extrusions.
3Loss of substance
If extruders are retracted and repositioned between deposits, then material management is improved, but build time increases due to transition delays
Solution Approach 1:
Both extruders are maintained in a continuous active state throughout the printing process, eliminating retraction and repositioning cycles. This continuous operation prevents material waste from retraction while also eliminating the time delays associated with moving extruders between deposits.
Solution Approach 2:
Both extruders are pre-positioned at the same Z-height and kept ready before deposition begins. This preliminary preparation eliminates the need for subsequent repositioning movements, reducing both material management issues and transition delays.
4Ease of manufacture
If dual extruders operate at different Z-heights, then material deposition control is improved, but surface quality deteriorates due to visible layer transitions and discontinuities
Solution Approach 1:
Both extruders are positioned at the same Z-height, creating an equipotential deposition plane. This ensures that material from both extruders deposits at identical vertical levels, eliminating visible layer transitions and surface discontinuities that would otherwise occur when extruders operate at different heights.
Solution Approach 2:
By positioning both extruders at the same Z-height, the patent creates homogeneous deposition conditions. Material from both extruders is deposited under identical vertical conditions, ensuring uniform surface quality and eliminating the heterogeneity that would result from different deposition heights.
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
This approach enables efficient, continuous extrusion with minimal extruder transitions, reducing build time and eliminating unwanted material strings, while allowing for high-resolution patterns and graphics to be seamlessly integrated into the 3D printed object.
Implementation Method 1
a thermoplastic filament of about 1 mm to 3 mm in diameter is forcefully driven into one port of a small heating block and melted plastic is forced out of a small nozzle
Implementation Method 2
Heated plastic from the nozzle comes into contact with the build plate, or with a specific spot on previously deposited plastic forming a composite workpiece, where it adheres and then cools and hardens
Implementation Method 3
Heated plastic from the nozzle comes into contact with the build plate, or with a specific spot on previously deposited plastic forming a composite workpiece, where it adheres and then cools and hardens
Data Source
AI summary
In the formation of a solid object by progressively depositing extruded materials accordance with a data model for shape of the object, a mechanism is disclosed for combining shape-related data with one or more sets of graphics data to produce alternative perimeter toolpaths that, when followed by an extrusion deposition system, both build the modeled shape and render the pattern content of the graphics data on an outer surface of the object. The disclosed teachings provide ways for a user to select a shape model from a first source and a surface graphic effect from a different second source and readily create a solid object having the arbitrarily chosen graphic content applied. In accordance with some embodiments, the shape-determined toolpaths may be directly combined with graphics data without returning to a shape modeling environment or requiring recalculation by a slicing engine.