Buying Guide

Best Flexible (TPU) Filament for Beginners (2026)

By the Daniel Bohannon team · 2026-07-16

TPU is the filament that makes people fall in love with 3D printing a second time — phone cases, gaskets, controller grips, drone bumpers, shoe... things. It's also the filament with the biggest gap between "printed right" and "printed wrong," and the wrongness is almost never the filament's fault. So this guide is half product picks, half the settings sermon that makes either pick work.

The two rolls worth buying

Both of these are 95A shore hardness — the friendly end of flexible, bendy like a tire rather than squishy like a gummy bear, and the right starting point for a first roll. The difference is tolerance and consistency: the SUNLU is the budget spool that made TPU accessible, and it's genuinely good; the Polymaker prints noticeably cleaner and faster before it starts misbehaving, with rounder diameter tolerance — which matters more for TPU than any other filament, because of how it's pushed (read on). Start with SUNLU to learn cheap; move to Polymaker when TPU becomes a regular part of your rotation.

The sermon (this is why your TPU prints failed)

Speed is everything. TPU is a soft noodle being shoved through a hot needle. Push it fast and it buckles, wraps around your extruder gear, and delivers you a bird's nest. On a Bowden printer (stock Ender-style), print at 20–25mm/s — yes, really, that slow. Direct-drive machines can go 35–50mm/s because the push distance is shorter. This single setting is most of the difference between people who say TPU is easy and people who say it's impossible.

Retraction wants to be nearly off. Retraction yanks the soft noodle backward, which is how it escapes the gear path. Cut it to 1mm or less (Bowden: consider zero and accept some stringing — TPU strings wipe off easily with a heat gun flick).

Dry it, always. TPU drinks moisture out of the air faster than any common filament, and wet TPU pops, strings, and comes out foamy-weak. If your roll has been out of a sealed bag for more than a week, four to six hours in a filament dryer (or a 55°C oven you trust) before printing isn't optional. Half the bad TPU reviews online are actually wet-filament reviews.

Temps and bed: 220–235°C nozzle, 40–50°C bed, no cooling fan or low fan for the first layers. It sticks to PEI ferociously — sometimes too well; a glue-stick layer as a release agent saves plates.

Who should skip TPU for now

If you're inside your first month of printing, get PLA boring first — TPU punishes an untuned machine. And if your printer has a long, cheap Bowden tube and you've been meaning to install that Capricorn upgrade anyway, do it before your first TPU roll, not after your first failure.

Bottom line

SUNLU 95A to learn on, PolyFlex when you're printing TPU monthly, 25mm/s on a Bowden, retraction near zero, and dry the roll. Follow those five clauses and flexible filament goes from the internet's scariest material to a Tuesday.