Why Print with TPU?
Thermoplastic Polyurethane (TPU) opens up a world of possibilities beyond rigid plastics. From phone cases and drone parts to gaskets and wearable devices, TPU's rubber-like flexibility makes it invaluable for functional 3D printing. But flexible filaments require different techniques — here's how to master them.
Printer Requirements
- Direct Drive Extruder (Highly Recommended): The short filament path between the drive gear and hotend is crucial. Bowden setups struggle because TPU compresses like pushing a wet noodle through a long tube.
- Enclosed Filament Path: Any gap between the drive gear and hotend is where TPU can buckle and cause jams.
- Heated Bed: 40-60°C is typically sufficient, though some TPUs print fine on unheated surfaces with glue stick.
Optimal Print Settings
- Print Temperature: 220-250°C (varies by shore hardness — softer TPU typically needs higher temps)
- Print Speed: Start at 15-20mm/s for the first layer, 25-30mm/s max
- Retraction: Disable or use minimal retraction (0.5-1mm) to prevent jams
- Flow Rate: 100-105% — slight overextrusion helps layer bonding
Shore Hardness Guide
- 95A: Firm, easiest to print. Good for phone cases, bushings
- 85A: Balanced flexibility. Ideal for drone parts, gaskets
- 60A-75A: Very soft. Requires excellent extruder. Best for shoe insoles, wearable tech
Common Issues & Fixes
- Filament buckling: Slow down, increase temp slightly, check extruder tension
- Stringing: Lower temperature, enable "avoid crossing perimeters"
- Poor bed adhesion: Use glue stick, increase first layer height to 0.3mm
- Under-extrusion: Loosen extruder idler tension, slow down further
Shop Flexible Filaments
Browse our selection of flexible TPU filaments at InnoStation 3D. We recommend pairing TPU with quality nozzles and build plates designed to handle the unique demands of flexible materials.