How to Get TPU to Stick (and Come Off Again)
Flexible filament flips the adhesion problem upside down. Fresh TPU on clean PEI grips so well that the real challenge is getting the part off without damaging plate or print — and most TPU 'adhesion settings' exist to weaken the bond, not strengthen it.
Why TPU grips so hard
TPU is soft and slightly tacky when molten, so it flows into every microscopic feature of the plate and keys itself in mechanically as well as chemically. It also barely shrinks, so unlike ABS there are no internal forces trying to pry it loose mid-print. The result: bonds that only get stronger with bed heat, on a material that never needed much bed heat in the first place.
The stock numbers — and why they are so low
Run the bed cool: 35 °C on textured PEI. Bambu’s TPU profile sets 35 °C on textured/engineering plates and 30 °C on the Cool Plate — barely warm. Most other vendors’ TPU baselines are equally low (Voron, RatRig, FLSun all default 35 °C). More heat means more grip means more plate damage at removal.
Filament settings → Filament (bed temperature row for your plate)Never print TPU on a SuperTack plate. The profile marks the combination unsupported (bed temperature 0): TPU bonds so hard to the high-grip coating that removal tears the coating off the plate. This is a hardware-damage rule, not a preference.
On smooth PEI, glue film as a release layer. Same trick as PETG: the glue is there so the part comes off without a fight. Textured PEI usually doesn’t need it.
When TPU genuinely won’t stick
It happens, and the causes are specific:
- Wet filament. Damp TPU bubbles at the nozzle and lays down a foamy, weak first layer. Dry
8 h at 70 °C— with TPU this is the first suspect, not the last. - Under-extruded first layer. Drag anywhere in the feed path (AMS, tangled spool, tight reverse-Bowden) stretches TPU before the extruder and starves the first layer. Feed from a free-spinning external holder; standard 95A TPU must not run through an AMS — see the TPU + AMS guide.
- Greasy plate. As with every material: dish soap, warm water, dry towel.
- First layer too fast. Flexibles need time to press in;
20 mm/son layer one is a good floor. The stock profile prints TPU’s first layer at 230 °C nozzle — if bite is weak, +5 °C there helps more than bed heat.
Getting parts off intact
- Wait for a cold plate. TPU’s grip drops substantially at room temperature. Patience beats prying.
- Flex the plate away from the part, working around the perimeter — peeling a flexible part off a flexed plate concentrates force at the bond line, which is exactly where you want it.
- Never scrape under soft parts with metal tools; the blade dives into TPU instead of under it. If a part resists, flex more, warm the plate 10 degrees and flex again as it re-cools.
For everything else flexible — speed limits, retraction, stringing — the TPU printing guide is the hub, with TPU stringing and TPU under-extrusion as companions. Cross-material adhesion rules: the main guide.
Frequently asked questions
What bed temperature should I use for TPU?
Run the bed at just 35 °C on textured PEI — Bambu’s TPU profile sets 35 °C on textured and engineering plates and 30 °C on the Cool Plate, and most other vendors (Voron, RatRig, FLSun) default to 35 °C too. More heat means more grip, which means more plate damage when you remove the part — most TPU adhesion settings exist to weaken the bond, not strengthen it.
Why won’t my TPU stick to the bed?
When TPU genuinely won’t stick, the causes are specific: wet filament that bubbles and lays a foamy first layer (dry 8 hours at 70 °C — with TPU this is the first suspect), drag in the feed path stretching the filament and starving the first layer (feed from a free-spinning external holder; standard 95A TPU must not run through an AMS), a greasy plate, or a first layer printed too fast — 20 mm/s is a good floor.
Can I print TPU on a SuperTack plate?
No — never. Bambu’s profile marks the TPU–SuperTack combination as unsupported (bed temperature 0) because TPU bonds so hard to the high-grip coating that removing the part tears the coating off the plate. This is a hardware-damage rule, not a preference. Use textured PEI at 35 °C instead, or smooth PEI with a thin glue film as a release layer.
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- Introduction to Bambu Lab Build Plates — Bambu Lab Wiki
- Filament Drying Recommendations — Bambu Lab Wiki
- OrcaSlicer vendor profiles — SoftFever/OrcaSlicer (GitHub)