3D Printing Nozzle Clogging Prevention via Position-Based Flushing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Three-dimensional printing systems face nozzle clogging issues due to high temperatures in the build area, which can cause the agent to dry out or boil in the fluid ejection device, leading to system failures and reduced device lifespan.
Innovation Solution
A method of controlling the fluid ejection device to flush agent through the nozzles when it unintentionally stops over the hot build area, using techniques like spitting or priming to cool down the device and prevent clogging, while also detecting the device's position to avoid agent dispersion on unintended areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fluid ejection device remains stationary on the hot build area during system failure, then the device can maintain its position for continued operation, but the agent dries out and clogs the nozzles
Solution Approach 1:
The system performs a preliminary flushing action by ejecting agent through the nozzles before complete drying occurs. The controller detects the stationary condition and initiates flushing cycles that prevent agent crystallization and nozzle clogging, maintaining device reliability without requiring movement.
Solution Approach 2:
The flushing operation maintains continuous agent flow through the nozzles while the device remains stationary. By continuously ejecting small amounts of agent, the system prevents complete drying and maintains nozzle patency, allowing the device to remain operational without movement.
2Reliability
If the fluid ejection device flushes agent continuously to prevent clogging, then nozzle reliability is maintained, but agent is wasted and evaporation increases
Solution Approach 1:
The controller implements periodic flushing cycles rather than continuous flushing. Agent is ejected in intermittent pulses through the nozzles, sufficient to prevent clogging but minimal enough to reduce evaporation losses and conserve agent material.
Solution Approach 2:
The system changes the ejection parameters by controlling the frequency, duration, and volume of flushing cycles. By adjusting these parameters dynamically based on device position and operational state, the system maintains nozzle clearance while minimizing agent loss through evaporation and waste.
3Reliability
If the device detects stationary position to prevent clogging, then flushing can be initiated, but the detection system becomes more complex
Solution Approach 1:
The position detection system leverages existing multi-functional sensors already present in the 3D printing system. The same sensors used for tracking device movement during normal operation are utilized to detect stationary conditions, eliminating the need for separate dedicated detection hardware.
Solution Approach 2:
The controller continuously monitors device position feedback from existing sensors and uses this information to trigger flushing operations when stationary conditions are detected. The feedback mechanism allows the system to respond automatically to position changes without requiring complex additional detection systems.
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 method effectively prevents nozzle clogging and extends the lifespan of the fluid ejection device by maintaining a cooling effect and reducing agent evaporation, ensuring continuous operation and preventing contamination outside the build area during system failures.
Implementation Method 1
flushing agent through at least one nozzle of the fluid ejection device... may produce a cooling effect on the fluid ejection device
Implementation Method 2
the high temperature may push the fluid ejection device surface temperature beyond a boiling point of the agent and boil agent inside the nozzles and adjacent fluidics
Implementation Method 3
boil agent inside the nozzles and adjacent fluidics
Data Source
Figure 1
Figure 2
AI summary
A fluid ejection device controller for controlling a fluid ejection device of a three dimensional printing system has a processor and a memory. The memory includes executable instructions that when executed by the processor causes the fluid ejection device controller to control a motion of the fluid ejection device to print agent onto a layer of build material in a build area; and to flush agent through at least one nozzle of the fluid ejection device in response to detecting, by the fluid ejection device controller, an erroneous stopping of the motion of the fluid ejection device and the fluid ejection device being positioned on top of the build area.