Torsional Strength in Fused Filament Fabrication 3D Printing

Abstract

Among robotics enthusiasts, fused filament fabrication (FFF) 3D printing has exploded in popularity. The ability to manufacture custom parts allows for a greater degree of freedom during the design phase. For example, mechanisms like the drivetrain, a hotbed of torsion forces, can be easily compressed to make room for additional functionality. However, such specific components are often unavailable for purchase. Therefore, the ability to manufacture custom torsionally resistant parts in an inexpensive manner is essential.

The objective of this study is to determine the FFF 3D printer settings that contribute significantly to a part’s torsional strength. This will be accomplished by altering either infill percentage or wall line count during printing while keeping all other settings constant among 30 individual test parts. Each part will be tested in a custom testing machine that applies a 9:1 gear reduction to simulate the maximum output torque of most hobbyist drivetrains. By measuring the amount of time each test part lasts before snapping, the setting granting the greatest increase in torsional strength can be determined.