FFF Filament Feeding Assembly with Adjustable Guide Rails
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Solution Overview
Problem
Existing fused filament fabrication (FFF) systems face challenges with uneven extrusion of different thermoplastic materials due to varying feed forces and the complexity of multi-material dispensing systems, leading to issues like friction and moisture ingress, especially when using multiple extruders.
Innovation Solution
A filament feeding assembly with two movable connectors and adjustable guide rails allows simultaneous feeding of filaments to a dual extruder print head through a common path, ensuring uniform extrusion by minimizing friction and reducing the need for a merger, while using a controller for precise filament selection and engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate filament drives are used to dispense different filaments, then each filament can be fed independently, but the system complexity increases and feed forces become uneven leading to poor extrusion quality
Solution Approach 1:
The patent merges multiple filament feed paths into a single common path that serves all filament feeders. Instead of having separate drive systems for each filament, the invention uses one shared drive mechanism that can selectively engage with different filaments through a switching mechanism, thereby reducing system complexity while maintaining the ability to feed multiple filaments independently
Solution Approach 2:
The single common path and shared drive mechanism are designed to be universal, capable of handling multiple different filament types through a selector switch. The drive system can be configured to work with any filament fed through the common path, making it multi-functional rather than requiring specialized drives for each filament type
2Ease of operation
If multiple separate filament drives with different feed forces are used, then each filament can be controlled independently, but uneven extrusion occurs due to varying feed forces
Solution Approach 1:
By consolidating all filament feed paths into a single common path with one shared drive mechanism, the invention ensures that all filaments receive identical feed forces. The selector switch allows independent control of which filament is fed, but the actual feeding action is performed by the same drive, guaranteeing uniform extrusion across all filament types
3Adaptability or versatility
If a merger is used to combine multiple filament paths, then multiple filaments can be fed to the extruder, but friction increases and moisture ingress occurs
Solution Approach 1:
The invention extracts and eliminates the merger component from the system by designing a configuration where all filament feeders discharge directly into a single common path without requiring a separate merging mechanism. This removal of the merger eliminates the sources of friction and moisture ingress that would otherwise occur at the merging point
Data Source
AI summary
Provided herein is a filament feeding assembly with a plurality of filament feeders arranged next to each other in a row. The filament feeding assembly has a first guide rail and a second guide rail, both arranged parallel to a straight line. The filament feeding assembly has first and second connectors movably coupled to the first and second guide rails, respectively. The filament feeding assembly has first and second suspensions arranged to adjustably couple the respective first and second connectors to the respective first and second guide rails. The first and second connectors pass each other by way of adjusting the distance between the first connector and the first guide rail and/or adjusting the distance between the second connector and the second guide rail.