AMS motor overload on new H2S

Bambu Lab H2 Series
1

We have received 2 of the H2S printers 2 days ago and I have been printing quite a bit on them. There seems to be a recurring issue with the AMS motor being overloaded when printing with Bambu’s PLA Matte (white) in the front section of the print bed (towards the door). Some prints I have had 7 or so disruptions where it would say the AMS motor is overloaded and I had to press “Finished, Continue”, which it would then do just fine.

The problem appears to be that the PTFE tube going from the back of the machine to the print head is slightly too short. You can actually see that when the print head reaches the front few centimeters of the print bed, there is almost a kink in the PTFE tube at the coupling in the back of the machine.

This seems to be a common and repeatable problem: https://www.reddit.com/r/BambuLab/comments/1kolwf8/ams_2_pro_ams_motor_overloaded/

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I think Bambu should update the firmware of the printer/AMS to raise the threshold slightly when printing PLA matte AND they should send everyone a longer piece of PTFE tube going to the print head.

This is clearly a design flaw and it appears they never tested the machine with all their own filaments and printing on the whole print bed.

2

I changed for a longer PTFE tube, because the bend into the print head was too tight.

3

Yes, I have some normal PTFE tube and some Capricorn XS tube ordered and will change it.

It’s fine to do these mods, but I am surprised that Bambu Labs didn’t figure out this design flaw by themselves. You would think they would at least test all their filaments and have it print some test object, which would surely cover the whole print bed.