Flexible filament is useful only when the printer can feed it consistently enough to finish the part. NinjaTek Cheetah TPU targets the buyer who wants rubber-like parts but does not want every job slowed to a crawl. This Midnight-color spool is 1.75 mm, 0.5 kg, and 95A Shore hardness. The current Amazon listing positions it as a faster-feeding flexible material for seals, plugs, hinges, sleeves, and snap-fit parts.
Cheetah is not a magic profile that makes every printer handle TPU like PLA. The filament path still matters, moisture still matters, and a Bowden setup with a large gap around the drive gears can still buckle flexible material. Its value is narrower: it gives buyers a relatively firm 95A TPU with a low-friction exterior and a manufacturer-listed speed range that is more ambitious than the very slow settings often associated with soft flexibles.
Short answer
NinjaTek Cheetah makes sense when flexible parts are recurring work and feed reliability or cycle time matters more than paying the lowest price per kilogram. It fits protective sleeves, grippy pads, seals, hinges, bumpers, snap-fit features, and other parts that need controlled flex rather than a soft silicone-like feel.
It is overkill for an occasional phone foot or test gasket that prints acceptably in an inexpensive 95A TPU. It is also the wrong material when the design needs very soft deformation, a formally certified end-use property, or long-term chemical exposure that has not been tested on the finished printed part.
What Cheetah is trying to solve
Soft filament can compress between the extruder gears and the hotend instead of moving forward. That creates inconsistent flow, tangles around the drive gear, or a print that stops extruding after several layers. Many operators respond by dropping speed aggressively, which can work but makes even a modest batch of flexible parts painfully slow.
NinjaTek says Cheetah uses a patented low-friction exterior for smoother feeding. The Amazon listing says it can print above 60 mm/s and gives more specific guidance of 30-45 mm/s for top and bottom layers and 60-80 mm/s for infill. Treat those numbers as a starting envelope from the listing, not a guarantee for every printer. Retraction, acceleration, toolhead geometry, nozzle size, part shape, and volumetric flow can all force a slower profile.
Where the 95A hardness fits
Shore hardness is not the whole feel of a printed part. Wall count, infill, geometry, layer orientation, and part thickness can make the same 95A filament feel either stiff or compliant. Still, 95A is a useful middle lane: flexible enough for many grips and bumpers, firm enough to feed more easily than very soft TPU, and predictable enough for parts that need elastic recovery without collapsing under light handling.
If the design needs a soft squeeze, start by confirming that 95A is not too firm. If it needs a living hinge or snap feature, print a small section with the same wall thickness and orientation as the final part. A generic flex cube cannot tell you whether a thin hinge will survive the real bend radius or whether a thick sleeve will be too difficult to install.
Best-fit uses
- protective sleeves and guards that need impact absorption
- grips, feet, pads, and bumpers that should resist sliding
- seals and plugs where the design can tolerate printed-layer texture
- hinges and flexures that have been sized for repeated bending
- snap-fit parts that benefit from elastic recovery
- repeat batches where slow flexible-filament profiles create a real queue cost
The listing also highlights toughness, elongation, abrasion resistance, and resistance to several named chemicals. Those are useful screening claims, but a printed part is not identical to a molded test specimen. Layer bonds, print settings, stress concentration, temperature, and exposure duration determine whether the final component survives. Test the printed geometry under the real load before treating it as production-ready.
Who should skip it
Skip Cheetah if the printer already runs a cheaper 95A TPU reliably and the job volume is too small for faster output to matter. The 500 g spool also costs more per unit of material than many commodity one-kilogram options. Premium feed behavior has to save enough time, failed parts, or operator attention to justify that difference.
Skip it for extremely soft wearables or squeeze parts when 95A is too firm. Do not choose it solely because a listing says "flexible." Match hardness and geometry to the actual deformation required. Also avoid assuming that chemical resistance, impact strength, or elongation figures automatically qualify a printed part for safety-critical, food-contact, medical, pressure, or sealing service.
Printer setup matters more than the brand name
A short, constrained filament path is the easiest environment for TPU. Direct-drive extruders usually reduce the unsupported distance between the drive gears and melt zone. Bowden systems can work, but the long tube adds compression and makes retraction harder to control. Inspect the path for gaps where filament can escape before blaming the spool.
Start with a clean nozzle and a smooth spool path. Excess holder drag can stretch and compress TPU before it reaches the extruder. Avoid sharp tube bends. Reduce aggressive retraction, keep acceleration reasonable, and make sure the idler tension grips without crushing the filament into an oval. If the material curls around the gear, slow down and fix the constraint around the drive path.
Temperature and speed guidance
The current listing recommends 235-245 C at the extruder and room temperature to 40 C at the build surface. It suggests glue or blue painter's tape when a heated bed is not used, then recommends cooling from layer two onward if the printer has a fan. Those values are vendor guidance for this product, not universal settings for every hotend and surface.
Begin near the printer or profile maker's supported Cheetah settings if they exist. Otherwise, use a short temperature and flow calibration rather than jumping straight to the top listed speed. Watch for under-extrusion in fast infill, excessive stringing, rough top layers, weak interlayer bonding, and a first layer that adheres too aggressively. Flexible parts can be damaged during removal if the surface grip is stronger than the part.
Moisture control still applies
TPU can absorb moisture from the air. A wet spool may hiss, pop, string heavily, leave a rough surface, or produce inconsistent extrusion. Faster feeding does not compensate for steam forming in the melt. If a new profile behaves unpredictably, separate moisture symptoms from speed and temperature before changing several slicer values at once.
Store the opened spool in a sealed container with effective desiccant. If drying becomes necessary, follow NinjaTek's current instructions for this exact material and spool rather than copying a random TPU temperature. A dry box can preserve a conditioned spool and reduce exposure during a long print, but it does not prove that a saturated spool has been restored.
Designing parts for 95A TPU
Printed flexibility is designed, not purchased. More walls and thicker sections increase stiffness. Sparse infill and thin sections increase compliance but may create local buckling or tearing. Rounded internal corners and generous transition radii reduce stress concentration. Layer orientation should keep the main repeated load from peeling layers apart.
For a sleeve, print a short ring with the final wall count and interference. For a hinge, print only the hinge and its anchors. For a bumper, test compression at the expected temperature. These small coupons reveal more than a generic benchmark and save expensive material when the geometry is wrong.
How it compares with cheaper 95A TPU
Commodity 95A TPU is often the better buy for low-volume jobs, slow printers, and designs that already succeed. Cheetah's case becomes stronger when the operator repeatedly loses time to buckling, inconsistent feeding, or conservative speeds. The comparison should be based on completed usable parts per hour, not spool price alone.
Run the same representative part with controlled moisture, nozzle, layer height, and geometry. Record print time, interventions, failed mass, surface quality, and dimensional fit. If Cheetah finishes reliably at a higher stable speed, the premium may pay for itself in a repeat queue. If both materials need the same slow profile, buy on fit, finish, availability, and cost instead.
A controlled first-spool workflow
- confirm that 95A hardness matches the part's required movement
- inspect the extruder and filament path for unsupported gaps and excess drag
- store the spool dry and record when it was opened
- start from current NinjaTek or printer-specific temperature guidance
- use conservative retraction and acceleration for the first test
- print a small coupon that copies the final wall thickness and bend direction
- increase speed in measured steps while watching flow and surface quality
- test the finished part under its real load before committing to a batch
Change one variable at a time. A random combination of more heat, more tension, less retraction, and lower speed may finish one print without revealing which adjustment mattered. A recorded profile is what turns a premium spool into a repeatable workflow.
Buying checks
- confirm the variation is Midnight, 1.75 mm, and 0.5 kg
- verify that 95A is soft enough for the design
- check that the printer can constrain flexible filament through the drive path
- budget for sealed storage and controlled drying
- compare usable throughput, not only price per kilogram
- test chemical, wear, and impact behavior on the printed part if those claims matter
Final take
NinjaTek Cheetah TPU is a premium flexible filament for buyers who value feed behavior and faster repeat output more than the cheapest spool price. The 95A hardness is a useful compromise for grips, sleeves, hinges, bumpers, seals, and snap features that need controlled flex without the feeding difficulty of much softer materials.
Buy it when flexible parts are recurring work, your printer has a controlled material path, and a reliable higher-speed profile can reduce queue time or failed parts. Skip it when a budget 95A TPU already works, when the design needs a softer feel, or when an untested material claim is being asked to carry a safety-critical job.
Affiliate link: Check NinjaTek Cheetah TPU on Amazon.
Frequently asked questions
Is Cheetah TPU soft?
It is flexible, but its listed 95A Shore hardness is firmer than very soft TPU grades. Part geometry, wall thickness, and infill determine how soft the finished print feels.
Can it print at 60 mm/s?
The listing says speeds above 60 mm/s are possible and gives 60-80 mm/s guidance for infill. Your stable speed may be lower depending on extruder design, retraction, acceleration, nozzle, and part geometry.
Does it require a direct-drive extruder?
No absolute requirement is stated on the listing, but a short, constrained path generally makes flexible filament easier to control. A well-tuned Bowden printer may work at a lower speed with limited retraction.
Does the spool need to be dried?
Keep it sealed with desiccant after opening. If moisture symptoms appear, use NinjaTek's current drying guidance for this exact material rather than guessing at a temperature.
Is a 500 g spool enough?
It is useful for evaluation and occasional flexible parts. Buyers running repeat batches should estimate finished-part mass, purge and test waste, and expected failures before choosing the smaller spool.