TPU is a type of thermoplastic elastomer, or TPE. These labels are not two mutually exclusive materials with a guaranteed easy-versus-soft winner. The exact formulation, hardness, printer and part design matter.

This research-based guide combines material selection with a documented candidate check. Sources were reviewed on 30 September 2026. We have not measured successful-print rates, fatigue life, rebound, chemical compatibility or total ownership cost.

Compare the grade, not just the family name

Prusa’s flexible-material guide explains the TPE family and TPU subtype and notes that softer filaments generally become harder to print. That does not establish that every spool labeled TPE is softer than every TPU spool.

Check the manufacturer’s stated Shore hardness and scale. A grade without a documented value cannot be assigned a numerical softness ranking. Do not directly treat Shore A and Shore D numbers as interchangeable.

Documented candidates and corrections

Candidate Manufacturer evidence Check before buying
eSUN TPU-95A Manufacturer identifies the 95A grade Exact diameter, color, net weight and supported printing guidance
Polymaker PolyFlex TPU95 Manufacturer identifies 95A TPU and grade-specific guidance TPU95 versus TPU95-HF or TPU90, plus the actual spool variant
MatterHackers PRO Series Flex Current page describes 98A flexible TPE and lists 0.5kg options Exact diameter and package; do not assume the former 95A/1kg description

These are documented candidates, not tested overall, value or first-print winners. Generic “PolyFlex” does not establish a particular grade or natural-color 1kg package. Likewise, the Hatchbox and 3D Solutech names alone do not provide enough evidence here to rank exact hardness, current package or rebound behavior. Obtain the corresponding current product documentation before comparing those options.

Match the printer and feed arrangement

Read the instructions for both the exact filament and printer, including any spool feeder or automatic material system. Direct drive, Bowden arrangements and multi-material systems have different constraints; a broad claim that TPU works on an ordinary path is not compatibility evidence.

Use the documented starting profile where supported, then record any changes with a representative test part. Do not apply one brand’s retraction, temperature or drying settings to every flexible filament. Check spool and equipment limitations as well as the material instructions.

Match the finished part

List the required fit, deflection, surface contact, temperature and chemical exposure. Hardness does not alone establish a printed part’s stiffness or suitability: geometry, walls, infill and print orientation also affect behavior. A strap and a protective cover can need different evidence even when made from the same grade.

Do not assume a flexible filament is qualified for skin contact, food contact, a pressure seal or a safety-critical load. Those applications require evidence for the actual material and finished part, beyond a generic family description.

Compare actual purchase and operating costs

Verify net filament weight separately from spool weight and compare equivalent packages. Include permitted test prints, drying or storage requirements and the setup your printer actually needs. There is no documented basis here for saying every TPU creates fewer failures or costs less to own than every other TPE.

The Amazon buttons are clearly labeled searches. Confirm the returned grade and package rather than assuming they identify a verified listing. Choose a documented grade that meets your printer and part requirements, then keep the settings and observations needed to reproduce the result.