UPDATED NOVEMBER 6, 2026

Bambu Lab H3C TPU: 75A and 90A on 2.85 mm FlexFeed

Q: Do I need a filament dryer for TPU on the H3C?

No. The H3C has built-in dual drying slots up to 85 degrees C, and the Combo includes the sealed AMS 3H, which keeps spools dry between jobs.

Last updated: November 6, 2026 · TPU 75A / 90A CONFIRMED · 2.85 mm FlexFeed CONFIRMED · up to 5× flow CONFIRMED

Soft TPU is the hardest material to feed, and the H3C is the first Bambu printer built around it. A dedicated 2.85 mm FlexFeed path handles TPU 75A and 90A, with Bambu quoting up to 5× conventional flow. Here is what is confirmed.

Why Soft TPU Needs a Different Feed Path

A 75A shore filament is genuinely rubbery. In a normal 1.75 mm extruder it buckles between the drive gear and the hotend, so the filament kinks instead of pushing through. That is why most printers stop around 95A.

The fix is mechanical, not software. FlexFeed uses a 2.85 mm strand — nearly 63% more cross-section — so the filament is stiff enough to resist buckling while still being soft. Bambu pairs that with a short, supported feed path.

The trade-off: 2.85 mm spools are not interchangeable with your 1.75 mm stock. Bambu sells the soft TPU specifically for the H3C.

Confirmed TPU Specs

Spec	Official value	Status
Supported soft TPU	TPU 75A and TPU 90A	CONFIRMED
Soft TPU diameter	2.85 mm via FlexFeed	CONFIRMED
TPU flow rate	Up to 5× conventional	CONFIRMED
1.75 mm filament	Also supported, same printer	CONFIRMED
Compatibility of soft TPU	Bambu lists TPU 75A as H3C-only	CONFIRMED
Nozzle temperature	350°C, hardened steel, HRC 55+	CONFIRMED
Drying	Built-in dual slots, max 85°C	CONFIRMED

What You Actually Buy

Bambu TPU 75A, 2.85 mm — the ultra-soft one. Start with a single spool; it behaves very differently from PLA and takes tuning.
Bambu TPU 90A, 2.85 mm — slightly firmer, better for functional parts like grips and gaskets.
Your existing 1.75 mm TPU (95A+) — still works on the H3C, no need to replace.
Nothing else — no dryer needed, since the H3C dries at 85°C and the Combo's AMS 3H is sealed.

What Is Still Unknown

Question	Status
Which of the 9 tools accept 2.85 mm FlexFeed	UNKNOWN
Whether AMS 3H can feed 2.85 mm, or TPU runs from a spool holder	UNKNOWN
Max volumetric flow in mm³/s (Bambu only gives the 5× claim)	UNKNOWN
Recommended print speeds and acceleration for 75A	UNKNOWN

FAQ

Can the Bambu Lab H3C print TPU 75A?

Yes. Bambu lists TPU 75A and 90A as supported on the H3C, using the 2.85 mm FlexFeed path.

What is FlexFeed on the H3C?

FlexFeed is a dedicated 2.85 mm feed path built for soft TPU. The thicker strand resists buckling in the extruder, which is what lets the H3C run 75A and 90A reliably.

Can I use my existing 1.75 mm TPU on the H3C?

Standard 1.75 mm TPU works on the H3C. Bambu's ultra-soft TPU 75A and 90A are sold as 2.85 mm and listed as H3C-only.

How fast can the H3C print TPU?

Bambu quotes up to 5 times conventional TPU flow with FlexFeed. It has not published a single max volumetric speed figure, so we do not state one.

Do I need a filament dryer for TPU on the H3C?

No. The H3C has built-in dual drying slots up to 85°C, and the Combo includes the sealed AMS 3H, which keeps spools dry between jobs.

Related Guides

H3C spec tracker — every official spec labeled confirmed / unknown
Swaptek 9-tool system — how the 6-second swap works
AMS 3H and 24 colors — sealed multi-color setup
H3C filament guide — 2.85 mm + 1.75 mm, full material list
H3C price — $2,499 Combo and what is included

Sources
[1] Bambu Lab official H3C product page and launch blog (Nov 3, 2026) — bambulab.com/en-us/h3c
[2] Bambu Lab EU store, "TPU 75A for H3C" listing: 2.85 mm, tolerance, FlexFeed, 5× flow, H3C-only wording.
[3] Bambu Lab official teaser: "TPU 75A: Our softest yet."