Prusament PA11 Natural vs Overture PA11 vs eSUN ePA11: Which Nylon Filament Wins for Gears?

The Nylon Gear Showdown

Nylon is the go-to material for functional parts that need to slide, mesh, and endure. Three leading PA11 options — Prusament PA11 Natural, Overture PA11, and eSUN ePA11 — all promise tough, low-friction parts. But which delivers the best balance of printability, mechanical performance, and value for gears and moving parts?

Prusament PA11 Natural: The Pure Polyamide

Price: ~$69 (800g spool)
Source: Prusa (castor-oil-based polyamide)
Key specs: Tensile strength anisotropy coefficient r=0.84, excellent layer adhesion, low friction, high UV resistance
Print temp: 260–280°C nozzle, 90–100°C bed
Enclosure: Recommended (chamber temp 40–50°C)

Prusa's PA11 Natural is the newcomer that drops carbon fiber entirely. The result is a material optimized for layer-to-layer adhesion and sliding properties. Prusa claims the highest anisotropy coefficient of all their filaments (r=0.84 vs 0.33 for PLA/PC Blend), meaning parts are much harder to break regardless of layer orientation. It's made from castor oil, offering high impact resistance even at low temperatures.

Overture PA11: The Budget Workhorse

Price: ~$45 (800g spool)
Source: Overture (also castor-oil-based)
Key specs: Good toughness, chemical resistance, low moisture absorption
Print temp: 240–260°C nozzle, 80–100°C bed
Enclosure: Recommended but less critical

Overture's PA11 undercuts Prusament by 35% while still delivering solid nylon performance. It's a popular choice for makers who want nylon properties without the premium price tag. The trade-off is less rigorous quality control and fewer published mechanical specs.

eSUN ePA11: The Value Option

Price: ~$40 (800g spool)
Source: eSUN (also castor-oil-based)
Key specs: Good wear resistance, low friction, chemical resistance
Print temp: 240–260°C nozzle, 80–90°C bed
Enclosure: Not required but recommended

eSUN's ePA11 is the most affordable of the three, targeting budget-conscious makers who still need nylon's toughness. It's widely available and compatible with most FDM printers, but lacks the premium quality control and detailed spec sheets of Prusament.

Head-to-Head Comparison

Real-World Performance for Gears

Prusament PA11 Natural: The standout is its anisotropy coefficient (r=0.84). For gears printed in the Z orientation, this means the layers won't delaminate under torque. Prusa specifically designed this for moving parts — the pure polyamide (no carbon fiber) gives better sliding properties than the CF-filled version. UV resistance means outdoor gear won't degrade. Best for: precision gears, hinges, outdoor moving parts.

Overture PA11: Solid all-rounder at a fair price. You won't get Prusa's published specs, but real-world testing shows good gear life and low wear. The lack of carbon fiber means less abrasive wear on your nozzle. Best for: general-purpose gears, prototypes, budget builds.

eSUN ePA11: The cheapest path to nylon. Performance is adequate for non-critical gears and moving parts. You'll get the basic benefits of nylon (toughness, low friction) without the premium quality control. Best for: learning nylon, non-load-bearing parts, high-volume printing.

Who Should Buy What

Choose Prusament PA11 Natural if: You print precision gears, hinges, or outdoor moving parts where failure isn't an option. You want the best layer adhesion and published mechanical data. The 70% price premium over eSUN is justified for critical applications.

Choose Overture PA11 if: You want reliable nylon performance at a mid-tier price. You're building functional parts that need to last but aren't mission-critical. You want a balance of quality and value.

Choose eSUN ePA11 if: You're new to nylon and want to learn on a budget. You're printing non-critical parts or prototypes. You print a lot and need to keep material costs low.

The Bottom Line

Prusament PA11 Natural is the clear winner for performance — its anisotropy coefficient of 0.84 is unmatched in the consumer market, and the pure polyamide formulation delivers superior sliding properties for gears. But at $69 per spool, it's 70% more expensive than eSUN. For most makers, Overture PA11 hits the sweet spot: solid nylon performance at a reasonable price. Save Prusament for parts where layer adhesion is critical, and go with eSUN for learning and non-critical prints.