TPU 1.75mm Filament Bundle 4kg (4x1kg) - High Speed Flexible TPU

In this review of the SUNLU TPU 4kg bundle the bottom line is simple: this pack is for makers who need reliable, flexible filament that prints fast and survives wear. The review finds the set - four 1kg spools in black, white, blue and red - particularly useful for wearable prototypes, robotics parts and phone or watch accessories because the material balances softness with resilience and prints at much higher speeds than typical TPU. For anyone wanting high elasticity, good layer bonding and vacuum-sealed spools for moisture control, this bundle delivers.

Key Features

• High speed printing: The filament is formulated to print up to three times faster than ordinary TPU, cutting print time on flexible parts without sacrificing quality.
• Durable TPU material: With a Shore hardness of 95A the thermoplastic polyurethane offers strong impact and wear resistance for functional parts used in daily life or sports.
• Excellent layer adhesion: Parts show consistent layer bonding and a smooth finish that reduces post-processing on small wearable or mechanical prints.
• Tight diameter tolerance: The 1.75mm filament has a dimensional accuracy of +/- 0.03mm, improving feeding consistency and compatibility with most FDM printers.
• Vacuum packaging: Each spool is individually vacuum packed to stay moisture-free from factory to printer, protecting printability of TPU.
• Ready-to-use color variety: The four-color set lets users prototype in neutral and bright colors without buying separate spools.

Who It's For

The SUNLU TPU bundle is best for hobbyists, makers and small-scale designers who need flexible, wear-resistant parts like watch bands, phone cases, insoles, gaskets and soft robotics components. It particularly suits users with direct drive extruders or printers that handle flexible filaments reliably and who want to reduce print time while keeping good surface quality.

Users who need ultra-soft elastomers, specialty medical-grade TPU or filaments for very large industrial machines should look elsewhere; similarly, if your printer struggles with flexible materials you may prefer a stiffer filament or a smaller trial spool before committing to 4kg.

Pros & Cons

Pros

• Fast printing formulation that reduces print times for flexible parts without obvious quality loss.
• Good wear and oil resistance with a resilient 95A hardness suited to functional items.
• Vacuum-sealed spools and tight diameter tolerance improve shelf life and feeding reliability.
• Four colors included give immediate options for prototyping and finished parts.

Cons

• Because it is a relatively firm 95A TPU, users seeking very soft, rubbery parts may find it too stiff.
• Some users report mixed results on adhesion depending on printer setup, so tweaks may be needed for flawless layers.

Specifications

Brand	SUNLU
Material	TPU (thermoplastic polyurethane)
Diameter	1.75mm (0.03mm)
Hardness	95A Shore
Total weight	4kg (4 x 1kg spools)
Packaging	Individually vacuum packed
Recommended print settings	Nozzle 210-230C, bed 50-60C, speed 80-120mm/s

Our Verdict

The SUNLU 4kg TPU bundle is a strong value for makers who need durable, fast-printing flexible filament in multiple colors. It works especially well for wearables, gaskets and light-impact parts where 95A hardness and excellent layer adhesion are advantages, and vacuum packaging helps keep spools ready to print. Those requiring ultra-soft elastomers or who cannot tune their printer for flexible filaments should consider alternatives, but for most hobby and small-pro setups this bundle is a practical, cost-effective choice.

Frequently Asked Questions

Can this TPU be used on Bowden printers?
It can be used on Bowden setups, but direct drive extruders generally yield more reliable feeding and fewer print issues with flexible TPU.

Does the vacuum packaging prevent moisture problems?
Yes, each spool is vacuum packed to reduce moisture uptake and preserve printability during storage and shipment.

What temperatures and speeds work best?
The recommended window is 210-230C nozzle, 50-60C bed, and 80-120mm/s for faster prints while maintaining good layer bonding.