SUNLU 4kg TPU 1.75mm Filament Bundle - Fast Flexible TPU

In this review of the SUNLU 4kg TPU filament bundle we look at who will benefit most and why this pack stands out. The single biggest reason to consider it is the combination of a high Shore hardness and a high-speed printing formulation that promises faster, flexible prints without losing resilience. Buyers get four 1kg spools in useful transparent shades, vacuum sealed for storage, making it a practical choice for hobbyists and small shops that need consistent, wear-resistant TPU for functional parts.

Key Features

• High speed TPU: SUNLU says this TPU prints up to three times faster than ordinary TPU, which reduces production time for flexible parts.
• 95A Shore hardness: The material balances softness and resilience so printed parts resist wear and shocks during sports or daily use.
• Excellent layer adhesion: The filament bonds well between layers to produce smooth, durable prints with fewer delamination issues.
• Dimensional accuracy: 1.75mm diameter with +/-0.03mm tolerance improves compatibility and reduces extrusion problems across many FDM printers.
• Vacuum packaging: Each spool is sealed to keep moisture out and preserve filament performance between purchases and prints.
• Ready color set: The 4-pack includes transparent plus transparent purple, green, and orange for visual variety without needing post-dyeing.

Who It's For

The bundle is aimed at makers and small workshop users who print flexible functional parts like watch bands, phone cases, insoles, gaskets, and soft robotic elements and want a filament that prints faster than typical TPU while still offering good elasticity and wear resistance. Its tougher 95A hardness is suited to parts that must endure impacts and repeated flexing.

Those who should look elsewhere include users needing ultra-soft elastomers below 95A, specialty chemical-resistant grades, or users who require single-color industrial packaging; this pack is focused on general-purpose high-speed TPU in a mixed color set.

Pros & Cons

Pros

• Good balance of flexibility and toughness for functional wearable and utilitarian parts.
• Faster recommended print speeds (80-120mm/s) help reduce job time for moderate-detail prints.
• Consistent 1.75mm diameter and vacuum packaging improve reliability and shelf life.
• Multiple transparent colors add visual options for prototypes and consumer products.

Cons

• 95A is relatively firm for TPU, so it is not ideal when a very soft, rubberlike feel is required.
• Some user reports show mixed feedback on durability and adhesion in extreme use cases, so testing for specific applications is advised.

Specifications

Our Verdict

The SUNLU 4kg TPU bundle is a practical value choice for makers and small shops that need a reliable, faster-printing TPU with a firm 95A feel. It delivers strong layer adhesion, consistent diameter, and vacuum-sealed spools, making it good value for flexible functional parts where toughness and print speed matter. Try a test print for your specific use to confirm adhesion and durability under your conditions.

Frequently Asked Questions

Will this filament fit my 1.75mm FDM printer?
Yes, the 1.75mm diameter with 0.03mm tolerance is suitable for most 1.75mm FDM printers.

What print settings work best?
Use a nozzle temp of 210-230C, bed temp of 50-60C, and try speeds in the 80-120mm/s range for faster results.

How is the filament packaged?
Each spool is vacuum packed to keep moisture out and preserve filament quality until use.