SUNLU TPU 4kg Filament Bundle 1.75mm - High Speed Flexible TPU

Our review of the SUNLU 4kg TPU 1.75mm filament bundle finds it best suited for makers who need dependable flexible material for functional prints and prototypes. The kit includes four 1kg spools in grey, blue, green and orange and delivers the standout benefit of faster TPU printing speeds while preserving flexibility and resilience, making it a practical choice for projects like keyrings, phone cases and wearable parts.

Key Features

• High speed printing: SUNLU claims this TPU prints up to three times faster than standard TPU, reducing job time for repeated flexible parts.
• 95A Shore hardness: The relatively firm but flexible Shore 95A formulation balances durability and elasticity for functional components.
• Excellent layer adhesion: Prints exhibit strong interlayer bonding and a smooth finish, which helps produce reliable wearable and mechanical pieces.
• Recommended print settings: The filament is tuned for 210-230C nozzle, 50-60C bed and 80-120mm/s print speeds for optimal results on compatible machines.
• Tight diameter tolerance: 1.75mm filament with +/-0.03mm accuracy improves feeding consistency and broad printer compatibility.
• Vacuum sealed packaging: Individual vacuum packs keep spools dry and preserve print quality until use.

Who It's For

This bundle is aimed at hobbyists, small workshop users and designers who print flexible functional parts like insoles, watch bands, gaskets, key ring cases and soft-fit components. The mix of four bright and neutral colors is convenient for small production runs or prototyping multiple color variants.

Users who need ultra-soft TPU for squishy silicone-like parts or require specialty polymer properties should look elsewhere, since the filament is Shore 95A and leans toward firmer flexible parts rather than very soft elastomers.

Pros & Cons

Pros

• Good print quality with reliable layer adhesion for functional parts.
• Fast-printing formulation shortens print times compared with typical TPU.
• Practical 1kg spools in four colors and vacuum packaging maintain material quality.

Cons

• Firm Shore 95A limits use where very soft elasticity is required.
• Adhesion and durability reports are mixed by some users, so settings tuning may be needed for certain printers.

Specifications

Our Verdict

The SUNLU 4kg TPU bundle is a strong value for users needing faster flexible filament with consistent diameter and good wear resistance. It excels for functional consumer and workshop prints where Shore 95A performance is appropriate, and the vacuum-packed spools help ensure long shelf life; those seeking very soft elastomers should consider lower Shore hardness options.

Frequently Asked Questions

Can this filament be used on direct drive extruders?
Yes. Many customers report the TPU works very well with direct drive systems and benefits from consistent feeding.

What temperatures and speeds are recommended?
SUNLU recommends nozzle 210-230C, bed 50-60C and printing speeds of 80-120mm/s for best results.

How is the filament packaged to prevent moisture?
Each 1kg spool is vacuum sealed to keep the filament dry and preserve print quality until opened.