3D Printing Pin Assembly for Unsupported Bridge Extrusion

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Solution Overview

Problem

Conventional FDM 3D printing faces challenges in connecting elevated structures with flowable filament material due to its fluid-like properties, necessitating the use of supporting materials that increase manufacturing complexity and cost.

Innovation Solution

A 3D printer system with a movable pin assembly and controller units that enable the extrusion of material directly between elevated structures without the need for additional support materials, using a pin assembly that moves in multiple axes to facilitate the deposition of extrudable material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If flowable filament material is used to connect elevated structures, then the 3D object can be printed with complex geometries, but the filament cannot support its own weight when laid horizontally in mid-air

Engineering Contradiction:

Improveability to create complex geometriesVSAvoidstructural support capability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a movable pin assembly as an intermediary element that extends from the build platform into the air gap between elevated structures. The pin provides a physical support mechanism that allows flowable filament material to be deposited horizontally in mid-air without collapsing, solving the contradiction between creating complex geometries and maintaining structural support capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If custom supporting structures are created to fill voids between elevated structures, then the flowable filament can be discharged between structure tops, but the manufacturing complexity and cost increase

Engineering Contradiction:

Improveability to discharge filament between elevated structuresVSAvoidsupporting structure manufacturing complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The pin assembly is integrated directly into the build platform structure, allowing it to automatically provide support for filament deposition between elevated structures without requiring separate custom supporting structures. The system serves its own support needs through the built-in pin mechanism, eliminating the need for additional custom-made supports and reducing manufacturing complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The build platform is designed with integrated pin assemblies that serve multiple functions: they provide structural support for filament deposition, define the separation space between elevated structures, and eliminate the need for separate supporting structures. This multi-functionality reduces device complexity while maintaining ease of manufacture.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If custom supporting structures are created for every project, then the voids between elevated structures can be filled, but the manufacturing time increases

Engineering Contradiction:

Improvefilament discharge capabilityVSAvoidsupporting structure manufacturing time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The pin assemblies are pre-integrated into the build platform structure during platform manufacturing, rather than being created separately for each project. This preliminary action eliminates the need for time-consuming custom support structure manufacturing for each print job, while still providing the necessary filament discharge capability between elevated structures.

Inventive Principle:

Principle #10Preliminary action

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 system simplifies the printing process by eliminating the need for custom-made supports, reducing manufacturing complexity and time, and lowering costs.

Implementation Method 1

heating a thermoplastic filament to make the filament flowable

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

heating a thermoplastic filament to make the filament flowable

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 3

an extruder, a filament feeding system configured to feed a filament to the extruder, a movable nozzle configured to receive heated filament from the extruder in flowable form

Methodology Applied

Scientific EffectExtrusion: Extrusion

Data Source

PatentUS12544982B1System and method for printing a three-dimensional object

Publication Date: 2026.02.10 KING SAUD UNIVERSITY

AI summary

A method of printing a three-dimensional (3D) object includes translating, via a primary control unit, received instructions into a series of electrical signals; sending, via the primary control unit, a first primary received signal or a second primary received signal to a secondary control unit, sending, via the secondary control unit, a first primary sent signal or a second primary sent signal, respectively, a primary sensor, and activating, via the primary sensor, a primary motor to move at least one pin in a first travel path or a second travel path, respectively, in an x-axis direction; and sending, via the primary control unit, a first quaternary sent signal from the series of electrical signals to a movable nozzle to cause at least one extrudable material to be extruded therefrom onto a first surface of a top build platform plate thereby creating a 3D object thereon.