3D Printing TPE: choose the right flexible filament grade.

TPE is a family. TPU is one member.

Thermoplastic elastomer, or TPE, is an umbrella term. TPU—thermoplastic polyurethane—is one of the materials within that wider family. In some filament catalogs, “TPE” is used more narrowly for a different flexible formulation, so comparing two labels without checking the polymer base can be misleading.

In Sungallon’s technical material, the flexible TPE system discussed is based on SEBS, a styrenic thermoplastic elastomer. The presentation describes a formulation approach using SEBS, oil and polypropylene. That is a different starting chemistry from TPU; the finished grade still needs its own data and print evaluation.

Hardness is only one part of the brief.

A hardness value describes one aspect of a material. It does not tell you everything about how an extruder will feed it, how the printed surface will feel or how a thin section will behave. Two parts with the same material hardness can also feel different because their geometry is different.

Describe the result you need as well as the target hardness: a grippy surface, a flexible joint, a cushion or a part that returns to shape. Share a drawing or reference sample and agree how the result will be judged.

TPE 85A or TPE 90A? Choose by the part.

For a TPE filament brief, name the grade as well as the word TPE. The Sungallon flexible-material presentation lists TPE 85A as the softer option and TPE 90A as the firmer option; both are starting points for a print trial, not universal performance guarantees.

The same presentation gives typical selection values of 85 Shore A, 6.0 MPa tensile strength and 470% elongation for TPE 85A, and 90 Shore A, 8.0 MPa and 540% for TPE 90A. Confirm the current SKU's technical sheet, test method and printer profile before production or any application claim.

• 探索 TPE 85A 丝材
• 探索 TPE 90A 丝材

Check the whole feed path.

Flexible filament needs an appropriate feed path and settings. A soft grade should not automatically be treated as compatible with every remote spool feeder or multi-material system. Confirm the exact printer, extruder and accessory combination with the relevant suppliers.

Avoid transferring a generic claim such as “no drying needed” to every flexible grade. Ask for storage and conditioning guidance for the actual filament and environment. The same discipline applies to nozzle temperature, speed and retraction: use an appropriate profile, then evaluate the result.

Start 3D printing TPE with a controlled profile.

TPE printing settings depend on the exact grade, printer and feed path. Start slowly, keep the filament path well supported and change one setting at a time. Record nozzle temperature, bed temperature, speed, retraction and layer height with every trial.

Do not copy a TPU profile or another supplier's temperature range as a production specification. Use the applicable SunDots technical sheet and validate the profile on the intended printer before making performance or compatibility claims.

• Dry and store the filament according to the grade documentation.
• Use the shortest, best-supported feed path available.
• Begin with a slow test print and minimal retraction.
• Keep a photo and settings record for each successful sample.

For a soft-and-hard part, test the interface.

Printing a rigid structure with a soft outer region is a design direction discussed in the Sungallon presentation. It means depositing materials in the same part, not blending two spools into a new polymer.

For your own design, evaluate whether the materials need to bond or mechanically lock together. Check the interface on a small sample before committing to a complete object. A successful visual print is a starting point; it does not answer every durability or adhesion question.