Bambu Lab TPU 95A HF Filament 1.75mm 1kg

A properly soft, rubbery TPU that prints three times faster than flexibles normally do. Shore 95A is the classic flexible-filament hardness — think phone cases, gaskets, drive belts, watch straps, shoe soles, vibration feet.

The usual complaint about TPU is that a print takes all day. Bambu tuned this one for speed without giving up the flexibility or the layer adhesion, which is the part that normally suffers when you push a flexible faster.

Not for the AMS. This is a genuinely soft filament and it will buckle and jam in a multi-material feed path. Run it from an external spool holder, direct into the extruder. If you need flexible material through an AMS, use TPU for AMS instead — it's a firmer 68D formulation made for exactly that.

At a glance

How soft is 95A?

Young's modulus is 9.8 MPa. To put that in context, our TPU for AMS is 1190 MPa and PETG is 2780 — this material is over a hundred times more compliant than the "flexible" one made for the AMS. A printed part squashes between your fingers and springs back.

It stretches to more than 650% of its length before breaking, and impact strength is 123.2 kJ/m².

Layer adhesion is exceptional — and this is the real headline. Impact strength across layers is 86.3 kJ/m², where most materials lose 80–90% of their strength in Z. TPU 95A HF keeps about 70%. Elongation across layers is still over 480%. In practice that means a printed gasket or strap won't split along a layer line, which is the failure mode people expect from FDM flexibles.

Printing it well

Cool bed, 30–35°C. Not 60. Hot beds make TPU bond so hard it can pull the PEI coating off the sheet. Glue as a release layer, and let the plate cool fully before lifting.

Overhangs are limited to about 55°, tighter than the 70° most materials manage. A soft extrudate droops where a rigid one would bridge, so design in more support or a shallower angle.

Cooling fan on, and it prints happily at up to 200 mm/s — roughly three times the pace of an ordinary flexible.

Storage

Bambu specifies under 20% RH, sealed with desiccant, and 70°C for 8 hours to dry.

At 1.08% water absorption this is one of the thirstiest materials we sell. Wet TPU is unmistakable — popping at the nozzle, a foamed rough surface, and weak spots. Keep it sealed between prints rather than parked on the machine.