Comparison
Polymaker PolyFlex TPU95 vs SUNLU TPU: Which Is Better in 2026?
| At a glance | Polymaker PolyFlex TPU95 | SUNLU TPU |
|---|---|---|
| Rating | ★★★★⯨ 4.6/5 | ★★★★★ 4.4/5 |
| Price | $30-36 / kg | $25-30 / kg |
| Best for | Anyone printing flexibles regularly who's tired of failed rolls. | First-time flexible printing on a direct-drive printer. |
| Guarantee | Amazon return policy applies | Amazon return policy applies |
| Check Today's Price → | Check Today's Price → |
Let's clear something up before anyone spends money: these two spools are the same material at the same hardness. Both are 95A TPU — the firm end of flexible, the kind a direct-drive extruder can actually push without the filament folding up like wet spaghetti. The real difference isn't chemistry. It's tolerances and price. Polymaker holds tighter diameter consistency and tunes PolyFlex to run faster than typical TPU. SUNLU sells a perfectly serviceable spool for about five dollars less per kilo.
So the question isn't "which is better." It's how often you print flexibles, and how much a failed print annoys you.
The two spools
Polymaker PolyFlex TPU95
Premium flexible filament that prints faster and cleaner than budget TPU.
$30-36 / kg · Amazon return policy applies
PolyFlex TPU95 runs $30–36 per kilo and carries a 4.6 rating — genuinely high for a flexible, because TPU reviews skew cranky. The material punishes sloppy hardware and impatient people, and the reviews reflect it. Polymaker's pitch is speed and consistency: it's engineered to print faster than typical flexibles, and the diameter control is tight enough that jams are rare. That second part is the actual selling point. With TPU, an inconsistent spot in the filament doesn't just leave an ugly line — it bunches up in the extruder and kills the print an hour in. Fewer dead prints is what the premium buys. Layer bonding is strong too, which matters on parts that get flexed thousands of times.
SUNLU TPU
Beginner-friendly 95A flexible filament for phone cases, gaskets, and grips.
$25-30 / kg · Amazon return policy applies
SUNLU TPU is the entry ticket: $25–30 per kilo, 4.4 rating, and firm enough at 95A that a stock direct-drive machine handles it without a fight. Phone cases, gaskets, vibration dampers, wheels, grips — the things most people want flexibles for in the first place — it covers all of them, and the printed parts are durable and abrasion-resistant. The catch is patience. You have to print it slow, and Bowden setups struggle with it. To be fair, Bowden struggles with all TPU; that's physics, not a SUNLU flaw.
How to actually decide
Go by volume, not by spec sheets.
If you print a flexible part a few times a year — a case here, some rubber feet there — buy the SUNLU. At that pace, slower print speeds cost you an evening at most, and there's no sense paying a premium for a spool that'll sit in a drawer absorbing humidity between jobs.
If flexibles are a regular part of your rotation, the math flips hard. Everything about TPU runs slow, so a failed print doesn't waste minutes — it wastes hours. A roll that jams less and runs faster pays back its premium the first time it saves a long print. Polymaker's best-for line is literally "anyone tired of failed rolls," and that's the right frame.
Two things matter more than the brand on the box. First, both want a direct-drive extruder — if flexibles are in your future, that's the hardware to have. Second, dry your filament. Both of these absorb moisture quickly, and wet TPU strings and bubbles no matter what you paid for it. A cheap filament dryer fixes more "bad TPU" complaints than switching brands ever will.
Who should skip both
If your printer is Bowden and you're not eager to fight it, hold off on flexibles entirely until you've upgraded. And if you just want a part that looks rubbery but never actually bends in use, PETG is cheaper and far easier to print.
Bottom line
Same hardness, same use cases, one honest gap: consistency. SUNLU for your first rolls and occasional prints. PolyFlex once flexibles become routine and failed spools start costing you real time. Neither choice is a mistake — one just matches your printing habits better than the other.