Print TPU as the flexible folds and use alternating PLA layers as a temporary separator; after printing, peel away the PLA to leave a connected TPU bellows. This is a fabrication concept, not a validated recipe: the available demonstration does not establish a pressure rating, airtightness, or fatigue life.
How the PLA-interface method works
Hackaday’s May 8, 2025 overview describes alternating TPU and PLA layers so the TPU connects through successive regions while PLA occupies the interfaces intended to separate. Once the print is complete, the PLA is peeled off, leaving the TPU folds. The goal is not to make a permanent PLA–TPU joint: PLA serves as a removable interface.
The reported simultaneous-print setup uses two independent extruders, one for each material. That describes the demonstration, not a universal requirement for every possible workflow or machine. If your printer cannot deposit both materials in the required sequence and geometry, the described one-job approach may not be practical. Hackaday’s overview also reports that TPU brands behaved differently and that the discussed Bambu Lab AMS setup produced brittle TPU prints, prompting feed-path workarounds. Those observations concern that demonstration; they should not be generalized to every AMS unit or TPU filament.
What to decide before printing
Printer and filament handling
Check that the machine can feed the chosen TPU reliably and can control the two material paths needed for the alternating deposition in the demonstrated method. TPU formulation and brand matter: a filament that works in one feed path may not behave the same in another. The available sources do not identify a universally suitable printer, TPU hardness, or filament SKU for this bellows.
#1 Best Overall
- TPU BUNDLE: TPU 3D printer filament combipack contains 4 spools, each spool contains 250g TPU filament Black, Clear, Blue, Red.
- SHORE 95A TPU FILAMENT: This hard yet flexible Shore 95A TPU material is perfect for everyday objects that need some give. With an excellent strength-to-weight ratio, it withstands wear and tear while maintaining a fresh look.
- FLEXIBLE AND SOFT: Bend, twist, and print! Our soft TPU filament offers superior flexibility, making it ideal for everyday items. With impressive strength and resistance to deformation, it’s perfect for reliable prints.
- NO CLOGS, NO BUBBLES: With a ±0.03mm tolerance, it ensures smooth feeding and extrusion. Each tpu filament roll is dried for 24 hours and vacuum-sealed for optimal performance.
- EASY TO PRINT: Nozzle Temperature: 190-230℃, Bed Temperature: 50-60℃, Printing Speed ＜60mm/s. Printing and Keeping Container's Humidity < 20% RH
Removable interface versus permanent bond
Published PLA–TPU interface studies generally measure adhesion on specified test specimens. Their results help show that material order, contact geometry, and process conditions can affect bonding, but stronger adhesion is not automatically desirable here: the PLA must release cleanly after printing. Neither study below establishes a setting that guarantees removable PLA for this bellows geometry.
Geometry and process choices
The pattern of contact, layer order, layer height, line width, temperature, and material pairing can all affect an interface. Treat published parameter findings as evidence about the reported specimens and conditions, not as drop-in settings for a bellows. The practical question is whether the intended geometry lets the TPU remain connected while the PLA can be removed without damaging those folds.
Rank #2
- 🧵Premium TPU 95A Flexible Filament – High-quality 1.75mm TPU filament with a Shore hardness of 95A, offering rubber-like elasticity, abrasion resistance, and impact strength for durable, flexible prints.
- 🎨Flexible Sizes & Easy to Use – Offered in 250g/1kg spools. Perfect for first-time users with zero learning curve. Note: For flawless print quality and optimal performance, we recommend drying the filament prior to printing.
- 🎯Smooth and Precise Printing – Consistent ±0.03mm diameter tolerance ensures stable extrusion, strong layer adhesion, minimal stringing, and clog-free printing on most FDM 3D printers.
- ⚙️Perfect for Functional Prints – Ideal for gaskets, seals, phone cases, vibration-dampening parts, wearables, robotics, and flexible prototypes that require both strength and stretch.
- 📦Moisture-Proof & Support Guaranteed – Each spool is vacuum-sealed with a desiccant for freshness, and Lotactree provides dedicated after-sales support for a worry-free 3D printing experience.
What interface studies do—and do not—tell you
| Study | What it tested or reported | How it applies here |
|---|---|---|
| 2021 PLA–TPU adhesion study | Tested PLA–TPU and TPU–PLA ordering across six surface-pattern combinations, with seven replicas per combination (12 combinations total). The study used Ultimaker PLA and Fillamentum Flexfill TPU 98A in 2.85 mm filament. It reported that TPU/PLA specimens performed better or very close to PLA/TPU specimens in paired pattern comparisons. | Shows that order and surface pattern can affect measured adhesion for the studied materials and specimens; it does not establish clean peel-away behavior or bellows performance. Read the study. |
| 2025 PLA–TPU bonding study | In its lap-shear tests, lower layer height and larger line width improved adhesion. It compared experimental layer-height conditions of 0.125 mm and 0.25 mm and reported improved bonding consistency from a temperature gradient at the interface under tested conditions. It used Ultimaker PLA and TPU with an Ultimaker 3 dual-extruder printer. | These are bonding results for the study’s test specimens, not recommended bellows settings. Adhesion improvements may conflict with the aim of making PLA removable. Read the study. |
| 2026 orientation and interface-design study | Reported up to a 389% increase in interfacial toughness compared with flat-oriented specimens in that study. | This result belongs to the study’s specimens and design; it is not a performance figure for TPU bellows with peel-away PLA. Read the study. |
The 2021 study’s abstract says: “Well-chosen printing parameters can prevent a drop in parts efficiency compared to component materials (depending on the materials combination).” That qualification matters: the result depends on the materials combination and test conditions, and the study sought adhesion rather than a removable interface.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is not established for this bellows
The cited demonstration and interface studies do not report a validated pressure capacity, an airtightness test, or repeated-cycle fatigue life for this exact bellows method. A visually successful print or a clean peel is not evidence that the part is safe for a pressurized, vacuum, sealing, or safety-critical application. Those uses require testing of the actual material pair, geometry, print process, and service conditions.
Quick Recap
Best Value
- 【High-Quality TPU Material】 Engineered for unparalleled flexibility and durability. Featuring Shore hardness of 95A, Overture TPU strikes the ideal balance between softness and resilience. Perfect for flexible applications, robotics, and fashion projects
- 【Excellent Layer Adhesion】 Setting the standard for impeccable layer adhesion and delivering impressive results. Overture TPU features optimal layer bonding and a flawlessly smooth finish
- 【Clog-Free & Bubble-Free】 Designed and manufactured with our patented clog-free formula to guarantee a smooth and seamless printing experience. All spools undergo thorough drying for 24 hours before packaging and are vacuum-sealed in resealable foil packaging. To maintain optimal performance, store TPU filament in sealed storage with desiccants (silica gel) or dry for >8 hours at 65˚C
- 【Wide Compatibility and Color Selection】 Overture filaments seamlessly integrates with most consumer and industrial 3D printers. Explore your creative side with our extensive selection of vibrant colors, ensuring a spectrum of possibilities for your unique creations
- 【Supported & Smooth Printing】 Print with confidence. Overture filament comes with dedicated support and a 1-year shelf life for unopened spools (proper storage required). We're committed to timely solutions for a seamless printing experience. Your reliable 3D printing partner
Rank #4
- 【TPU for Fast Printing】- SUNLU High Speed TPU Filament can print 3 times fast as ordinary TPU filaments, strikes the ideal balance between softness and resilience. Perfect for flexible applications, robotics, and fashion projects.
- 【TPU 3D Printing Filament】- TPU filament is made of flexible thermoplastic polyurethane, featuring Shore hardness of 95A, and items printed with it can easily withstand severe collisions during sports and wear and tear in daily use.
- 【Excellent Layer Adhesion】- Setting the standard for impeccable layer adhesion and delivering impressive results. SUNLU TPU features optimal layer bonding and a flawlessly smooth finish
- 【Excellent Printed Results】- SUNLU TPU filament 1.75mm has excellent layer adhesion, very easy to print. TPU filament is wear-resistant, oil-resistant, good elasticity, anti-aging, color, no bobble.
- 【TPU Recommend Settings】- We recommend printing at a nozzle temperature of 210-230°C, bed temperature of 50-60°C, printing speed of 80-120mm/s, faster and better.
Rank #3
- 【95A High-Elasticity & Wear-Resistant TPU Material】: Crafted from premium thermoplastic polyurethane (TPU) with a Shore hardness of 95A±2, this filament balances exceptional elasticity and toughness. Prints easily withstand daily wear, impacts, and slight stretching/deformation—ideal for flexible applications like phone cases, insoles, watch bands, robotics parts, flexible toys, and more. Perfect for both creative designs and functional flexible components, blending softness with durability.
- 【Clog-Free & Bubble-Free for Smooth Printing】: Equipped with a patented clog-free formula and 24-hour pre-drying process, it minimizes jams and bubbles from the source, ensuring consistent, smooth extrusion. Each spool comes vacuum-sealed in a resealable foil bag with desiccants. For optimal performance, store in sealed containers with desiccants after opening (recommend drying at 65-70°C for 8+ hours if exposed to humidity). Even beginners can achieve stable, hassle-free prints.
- 【Strong Layer Adhesion & Smooth Surface Finish】: Enhanced layer bonding technology ensures tight interlayer adhesion with zero delamination risk, delivering prints with a flawlessly smooth surface. Boasting wear resistance, oil resistance, and anti-aging properties, it resists cracking or fading over time—whether for detailed decorative pieces or load-bearing flexible parts, maintaining high-quality appearance and structural stability.
- 【1.75mm High Precision & Wide FDM Compatibility】: Strict dimensional control guarantees a 1.75mm diameter with ±0.03mm tolerance, validated by an advanced CCD diameter inspection system for consistency. Fully compatible with most 1.75mm FDM 3D printers (desktop and industrial models), and optimized for direct-drive extruders—no frequent adjustments needed to work with mainstream devices.
- 【Helpful Printing Guides & Worry-Free Support】: Recommended settings: Nozzle temperature 180-210°C (356°F - 410°F), bed temperature 50°C - 70°C (122℉~ 158℉), print speed 20-40mm/s (adjust by printer model). Pro tip: Maintain storage humidity <20% RH (sealed with desiccants) for best results. Backed by lifetime after-sales support—from parameter to troubleshooting, we’re here to guide beginners and pros alike for a seamless 3D printing experience.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
