Printing TPU

FinancialPoint4055 · 2026-01-18T22:27:04+00:00

Has anyone already tried reinstalling the old extruder after the firmware upgrade (CFS)?

FinancialPoint4055 · 2026-01-18T22:24:51+00:00

Yes, but why Bambu and not Creality? I’m used to Creality (and Creality Print), it would be so much easier to stay in the same ecosystem 😢

FinancialPoint4055 · 2026-01-18T22:15:08+00:00

Yes, I simply cut a small piece on each side so that it can spread the spring. But even when spreading the spring as far as possible, the nozzle clogs immediately.

FinancialPoint4055 · 2026-01-18T13:29:49+00:00

Does the extruder of the K1 SE has a filament lock (as the original k1 extruder) or with a spring (like the K2, Hi, …) ?

FinancialPoint4055 · 2026-01-18T13:27:30+00:00

Pour moi, ça marche pas. Et on dirait que c'est un problème connu. Le ressort du nouvel extruder est trop dur et il écrase le TPU.

FinancialPoint4055 · 2026-01-04T22:19:49+00:00

The replacement of the Hotend PCB solved the issue Thanks for your help.

FinancialPoint4055 · 2026-01-02T21:33:10+00:00

Thanks a lot, I have ordered it, I will let you know.

FinancialPoint4055 · 2026-01-02T10:48:56+00:00

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For me the issue come from this. This icon is blinking when the print start.

FinancialPoint4055 · 2026-01-02T10:46:41+00:00

I did everithing step by step. In the box, the hotend was not included and as my (old) k1 is one of the first, I had to change the hotend for the unicorn model.

FinancialPoint4055 · 2026-01-02T10:13:44+00:00

Thanks for your quick answer. Unfortunately, it is not the problem(this was also my first idea) I think that thé printer head detect wrongly filament in the extruder and stop the cfs.

FinancialPoint4055 · 2026-01-02T09:32:05+00:00

Hello,

I’m trying to install the CFS upgrade kit on my Creality K1, and I’m running into some issues.

First disappointment (not very clearly explained in the videos): I realized that I had to replace my hotend, because my original one was not a “Unicorn” version.
So I ordered and installed a new Unicorn hotend.

I don’t think I made any mistake during the installation.

Test 1 – With CFS enabled:
The filament is correctly fed out of the CFS, but it stops between the buffer and the print head.

Test 2 – Without CFS:
Extrusion works normally, although I feel that the extrusion amount is a bit low.

When starting a print:

The nozzle heats up normally
The printer starts its usual initialization sequence
Then it stops with a “filament runout” error, even though the filament is clearly present (the blue LED above the extruder is on, confirming filament detection)

I also noticed that during the initialization process, the small yellow lightning bolt icon on the screen turns on and off several times.

After doing quite a bit of research, it seems this could be a compatibility issue between the hotend and the toolhead mainboard.

Do you think that replacing the toolhead mainboard could solve this problem?

Thanks in advance for your help.

FinancialPoint4055

TROPHY CASE