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.