TPU vs Nylon: Which Filament for Shop Tools?

If you're printing tools that actually get used in a shop, the filament choice matters more than the design. Two materials dominate: TPU and nylon. Here's when to use each — and why Kaizen Forge uses both.

TPU: The Flexible Survivor

TPU (thermoplastic polyurethane) is the rubber-like filament. It flexes, absorbs impact, and shrugs off chemicals.

Best for:

• Magnetic battery bases — it grips surfaces and won't scratch paint
• Anything that gets dropped — it bounces instead of shattering
• Parts exposed to brake cleaner, degreaser, and oil

Nylon (PA): The Structural Backbone

Nylon is the workhorse of engineering filaments. Add carbon fiber (PA12-CF) and it gets stiffer and stronger while staying tough.

Best for:

• Seal drivers that take hammer strikes — PA12-CF won't mushroom like brass
• Anything load-bearing or impact-rated
• High-heat environments — nylon handles temps that melt PLA

The Simple Rule

If the part needs to flex or protect surfaces → TPU.
If the part needs to take abuse and hold shape → nylon (PA12-CF).

Why We Use Both

Our magnetic battery bases are TPU — they grip and protect. Our seal installer kits are PA12-CF — they take the hits. Every material choice is about what the tool actually does in the real world.

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