Polyamide for light-duty gears: supplier claims and fit checks

Define the non-critical scope

Here, “light-duty” defines the project scope rather than a certified mechanical class. Consider a hand-driven kinetic model where a meshing fault simply stops the demonstration. Before adopting that scenario, check the actual consequences of a jam or breakage in your assembly. The two Prusa documents describe material properties and recommendations for named products; they do not give service life, fatigue results, or a meshing clearance for this model.

This is distinct from the functional-parts guide: it looks only at what two Prusa documents say about polyamide and how to evaluate a prototype in its intended use. The general guide lists gears among its polyamide examples; the launch post makes a recommendation about PA11 Natural. Neither specifies tooth clearance, load, speed, or dimensional results for your mechanism.

What the sources say about polyamide

Prusa’s general guide describes polyamide as abrasion-resistant and having a low coefficient of friction; it lists gears among sample prints. The Prusament PA11 Natural launch post attributes low contact friction to polyamides and says moving parts can perform well against wear in suitable applications. It names gears as an example. These are supplier statements, not results from a comparative test of printed gears.

These documents do not rank nylon against PLA, PETG, or filled PA for gear wear. The tensile and impact data published for PA11 Natural do not measure friction, tooth clearance, fatigue, or wear in a gear. Treat polyamide as a documentary candidate to check on a non-critical prototype, not as a guarantee. Prusa’s general guide also says polyamide is difficult to print and recommends it for experienced users.

PA11 Natural and filled PA11: distinct supplier claims

The launch post contrasts the properties Prusa claims for its two grades: PA11 Carbon Fiber prioritizes temperature resistance and dimensional stability; PA11 Natural prioritizes layer adhesion and sliding properties. The post does not test these grades in gears or specify which gear geometry, load, or wheel shape suits either one. For a prototype, first compare the instructions for the exact grade, then check the fit in your mechanism.

For PA11 Natural printed on a CORE One+, the post reports 38.3 MPa in XY, 39.5 MPa in XZ, and r = 0.84, which it calls the “tensile strength anisotropy coefficient.” It also lists r = 0.60 for PLA High Speed, 0.38 for PETG, and 0.33 for PLA and PC Blend. The two cited documents do not define how r is calculated: do not recalculate it from rounded tensile values or interpret it as friction, gear wear, or gear life.

Moisture, drying, and tooth accuracy

Prusa’s general guide says improperly stored polyamide can absorb water weighing up to 10% of the filament’s mass. It says wet filament can produce bubbles and uneven layers. Those statements support checking storage and print condition; they do not quantify gear-tooth accuracy, noise, or backlash. On a prototype, measure dimensions and inspect meshing rather than automatically attributing a defect to moisture.

Keep the drying instructions tied to their sources: the general polyamide guide recommends at least 4 hours below 90 °C; the launch post ideally recommends 90 °C for 6–8 hours for Prusament PA11 Natural. Do not average these values or transfer the PA11 profile to another spool. Check the material sheet and the limits of the exact dryer, then store filament as instructed. The dimensional check proposed elsewhere on this page is a prototype check, not a guaranteed consequence of drying.

Prepare for printing polyamide

Prusa’s general polyamide guide lists a nozzle around 285 °C and a bed at 110 °C in the context of its general recommendations. These are not universal settings or, by themselves, a PA11 Natural profile. The guide names warping as a drawback of pure polyamide and says a high ambient temperature, such as in an enclosure, helps reduce it. The PA11 Natural post names CORE One+, CORE One L, and Pro HT90 as suitable for that grade when equipped with active filtration; it separately mentions an enclosure and advanced filtration available for MK4S and XL, without giving a validated PA11 profile for every setup. Check the machine, accessory, and profile that match your spool.

Both Prusa documents call attention to odor and ultrafine particles when printing polyamide. The general guide requires a well-ventilated room or an enclosure; the PA11 Natural post recommends either an enclosure with active filtration or a well-ventilated room. Also follow the safety data sheet and equipment instructions. For Prusa’s PA Nylon sheet, the PA11 post prescribes washing with water and forbids acetone, IPA, and other alcohol-based cleaners; it mentions dish soap for grease and a thin glue-stick layer as a separation layer for large, mostly solid parts. Those instructions apply to that sheet, not to plates from other brands.

Annealing and heat resistance: handle with measurements

The PA11 Natural post reports an HDT of 58.7 °C under a 0.45 MPa load for the as-printed part and 122.5 °C after annealing. It describes a process for that grade: ramp to 110 °C at 1.5 °C/min, hold for 6–8 hours, then cool at the same rate; it notes possible yellowing. Drying the spool at 90 °C is a different process. The post does not name a detailed test standard or method for these figures.

These loaded HDT values are not a service temperature for a gear or an endurance result. The two sources do not measure dimensions before and after annealing. If you consider this cycle for a prototype, compare dimensions and meshing before and after, then check the part under its intended use conditions. This is a proposed check; the documents guarantee neither dimensional change nor a universal improvement.

A trial protocol before the final version

The two sources give no recommended clearance, required lubrication, or cycle count for these gears. What follows is a proposed evaluation for a non-critical prototype, not an established design rule. Print one pair in the chosen material after following its own drying instruction. Record relevant dimensions, assemble the mechanism, and make an initial unloaded check; if motion binds, stop and correct the model or assembly before any extended trial.

If that initial check is satisfactory, you can define a limited trial for the intended use and record the chosen load, speed, ambient temperature, and duration. Inspect the teeth and backlash during the trial; stop if wear or unexpected behavior appears. Those parameters are assumptions in your scenario, not instructions from Prusa. Compare a second material only if you can hold the same conditions. The two cited documents give no gear service life, so this page cannot predict one.

Sources and limits

• Prusa — Prusament PA11 Natural, July 23, 2026
• Prusa — Polyamide (Nylon)

We organize manufacturer and community documentation; we have not measured these products ourselves. The manual for your exact model takes precedence over general guidance.