Bambu Lab TPU for AMS

Flexible Filament That Actually Works in the AMS

Most TPU and an automatic material system don't get along — soft filament buckles in the feed path and jams before it ever reaches the hotend. Bambu Lab solved that by making TPU for AMS harder than typical flexibles: at Shore 68D it holds its shape well enough to be pushed through a Bowden path and an AMS buffer, while still bending, compressing and bouncing back like a proper elastomer. With a breaking elongation above 650% and 22.4 MPa tensile strength, it is closer to tough engineering rubber than to a soft squishy TPU.

That unlocks the thing flexible printing has always missed: multi-colour and multi-material flexible parts, printed unattended. Think two-tone phone and tool cases, grippy feet and bumpers, gaskets and seals, drone and RC tyres, vibration dampers, watch straps, hinges and living joints, protective covers, and prototype parts that need to survive being dropped. It suits hobbyists stepping into flexibles for the first time, makerspaces and schools who want TPU that won't jam a shared printer, and small businesses printing functional end-use parts.

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Key Features

AMS & AMS lite compatible Shore 68D hardness >650% elongation at break 22.4 MPa tensile strength Up to 18 mm³/s flow ±0.05 mm tolerance RFID auto-recognition Reusable spool Abrasion & oil resistant

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Print Settings

On a Bambu Lab machine the built-in profile handles all of this automatically once the spool is recognised. If you're tuning manually or printing on another printer, start here:

• Nozzle temperature: 220–240 °C
• Bed temperature: 30–35 °C (a thin layer of glue stick is recommended — both for adhesion and to protect the plate)
• Print speed: under 250 mm/s, with a maximum volumetric flow of 18 mm³/s — slower outer walls give the cleanest finish on flexibles
• Cooling: part cooling fan on for bridges and overhangs; exact fan percentage [VERIFY]
• Nozzle: hardened steel (0.4 / 0.6 / 0.8 mm) or stainless steel (0.4 mm). Do not use a 0.2 mm nozzle — the flow requirements will clog it
• Enclosure: not required — TPU prints happily with the door open

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Specifications

Material	TPU (thermoplastic polyurethane), Shore 68D
Diameter	1.75 mm
Diameter Tolerance	±0.05 mm
Spool Weight	1 kg net, on a reusable spool
Print Temp	220–240 °C
Bed Temp	30–35 °C (with glue)
Density	1.26 g/cm³
Elongation at Break	> 650%
Tensile Strength	22.4 ± 0.6 MPa
Drying	70 °C for 8 hours (blast drying oven)
Compatibility	AMS and AMS lite; open-frame and enclosed FDM printers with a direct-drive or capable Bowden extruder
Colours Available	7 — Red, Yellow, Blue, Neon Green, White, Gray, Black

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Available Colours

Seven colours, all sharing the same specs and profile — pick your shade from the dropdown above. Load several into the AMS and print flexible parts in full colour.

Red · 53200 Yellow · 53400 Blue · 53600 Neon Green · 53500 White · 53100 Gray · 53102 Black · 53101

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Tips From Our Workshop

Dry it, especially in an Australian summer. TPU is one of the thirstiest materials on the shelf — it pulls moisture from humid air within hours, and wet TPU prints with popping sounds, stringing and a rough, furry surface. Run it at 70 °C for 8 hours before a big print, and store the spool sealed with desiccant below 20% RH between jobs. If you live anywhere coastal, treat the dry box as mandatory rather than optional.

Slow your walls and skip the glue at your peril. If you see gaps or under-extrusion on perimeters, drop outer wall speed rather than raising temperature — flexibles need time to flow, not more heat. And always put a thin layer of glue stick down: TPU bonds aggressively to a bare textured PEI plate and can tear the surface off when you remove the part. The glue is a release layer as much as an adhesive.

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