Common 3D Printer Filaments 3D printing filaments in FRC form a spectrum of materials that trade off between ease of printing, stiffness, toughness, and flexibility . Understanding how they relate helps teams choose the right material for each application instead of defaulting to one. The “Spectrum” of Filaments You can think of common filaments as a progression: PLA → PETG → ABS → Nylon → TPU As you move right: Parts become tougher and more impact-resistant Flexibility increases (until TPU) Printing difficulty generally increases Heat and fatigue resistance improve Rigid vs. Tough vs. Flexible PLA (Rigid, easy, brittle) Most rigid but least durable Breaks suddenly under impact Best for prototypes and fit checks ➡️ Baseline material PETG (Tough, slightly flexible) Similar stiffness to PLA but much tougher Absorbs impacts instead of cracking Good “default functional” material ➡️ Step up in durability from PLA ABS (Tough + heat resistant) Similar toughness to PETG but better heat resistance More stable in warmer environments Warps more easily when printing ➡️ Functional + environment-resistant upgrade Nylon (Very tough, wear-resistant, flexible) Much more impact resistant than ABS/PETG Excellent fatigue resistance (bending repeatedly) Lower stiffness than PLA/ABS but far more durable ➡️ Best for moving/wear parts TPU (Flexible, elastic) Completely different behavior from others Bends, compresses, and returns to shape Absorbs impact instead of resisting it ➡️ Used when flexibility is the goal How They Compare in Use PLA: “Does it fit?” prototypes PETG/ABS: Real robot parts with moderate load Nylon: High-stress or moving parts TPU: Contact, grip, or shock absorption Key Relationship Idea These filaments are not separate choices—they form a progression from rigid and easy (PLA) to tough (Nylon) to flexible (TPU) . Most FRC teams use a mix depending on whether the part needs accuracy, strength, wear resistance, or compliance.