Bambu support thinks this is normal

Bambu Lab P Series Troubleshooting
1

I’ve been working with support for a couple months on this problem I have on my P1P since firmware update 1.08. The ticket is now closed because they don’t see anything strange.

They say it’s normal, but to me it’s clearly not normal.
The print head smashes into the poop chute.
It happens when loading filament at the last time it stops at the chute, so after the last turnaround at 240 degrees.
Normally is slows down just before the chute, but from firmware 1.08 it doesn’t slow down and just smashes into the chute. This is normal says Bambu.
It also happens with all the new firmwares. Only before 1.08 works fine.

Whenever I go back to formware 1.07 the problem is gone.
The printer is fully stock.
I’ve tried factory resets, calibration, tightning of the belts, nothing changes it.
Anyone else with the same issue?

This is the video of the 1.08 firmware version. Can you spot the problem?

2 Likes
2

This is a long video. Where does the “smashing” occur?

3

I thought 46 seconds was pretty short. It is around 25 seconds.
I will make a version of less then 10 sec :grimacing:

1 Like
4

Here is the shorter version:

5

Thanks, I did see that in your longer video, but I wouldn’t really describe it as “smashing” since it’s not actually pushing the machine beyond its designed limits. You could just as easily say the head “smashes” into the poop chute lever during the side movement at 41 seconds, but that lever is built for the print head to press into it.

Why not just edit your “Machine start G-code” so it does exactly what you want at startup, instead of relying on whatever Bambu Lab thinks is best?

1 Like
6

Ok, so this is how it stops with the 1.07 firmware. It clearly slows down and stops slowly at the chute. This is how it always has been working.
This is normal for me. And since 1.08 it sound to me only only stops because it can’t go any further.

7

i can imagine that they increased the speed to make sure the poopchute is free of any potential poop stuck there, by giving it a good whack to clear it out. The sound you hear is the lever hitting metal “flap”/ it hitting the chute.

image
image1444×1217 96.9 KB

I’m doing some prototyping right now and have to start a print soon, i’ll check how mine hits hit.

3 Likes
8

It stops there because the printhead has reached its endpoint. So yes, it looks like something has changed, but I don’t see it “smashing” into anything or causing any damage to your printer.

If you’re not happy with it, the best option is to customize your G-code. I doubt you’ll convince Bambu Lab to make your preferred version the default G-code.

9

Can I have 46 seconds back please.

That is normal behavior. You owe support a drink.

2 Likes
10

I do have one of the first P1P models. So without the rubber thing at the end of the lever. Maybe that is why it sounds very loud to me

11

Sorry, to me it sounds very strange and when this started to happen my extruder gear broke. To me it sounds like it wants to keep going. In the 2000 hours before the 1.08 update it never did this. It sounds like it’s smashing. Just like the printbed problem in the beginning when the bed moved below zero. That also made the sound of things breaking.

12

Hmm. The G-code thing could be useful. Do you know if the G-code in the slicer changes when I update to 1.08? Then I will just save the version I now have with 1.07.

13

actually i just watched my printer and it does move slowly to the chute like here:

i’m on 01.08.01.00 P1S

3 Likes
14

Well I’ve been on that firmware with nothing unusual. On .09 with no issue. I saw your vid and don’t think anything unusual is happening.

15

Yeah that is how it should be. I’m not sure why mine doesn’t slow down anymore before the chute. For now I just stay on 1.07 and everything is fine. But eventually 1.07 isn’t supported anymore and I will be forced to upgrade again.

16

Does yours also not slow down before the chute?

17

Does it remain the same after a factor reset on .09? Sometimes that clears up the oddest of issues.

If in fact the printer is trying to drive past the poop chute location you will probably see a print offset further and further each time it does it. If you pause the print (which sends the head to the chute) does it resume correctly on the print?

2 Likes
18

P1S (not p1p), 1.07.00, and it does tap the chute. Microphones gonna microphone so I wont judge the intensity of your video, but it didn’t seem out of whack. There is a bumper back there that it’s designed to be contacting (top left of toolhead contacts the block up and to the left of the chute)

19

I tried factory resets on 1.08 and 1.08.2 but not anymore on 1.09. but it didn’t change anything.

It does seem to print fine, although I have a layer shift if the filament runs out and I change it. But I think most P1P usrs have that. I think I even have that on the 1.07 version. I haven’t tried to pause it to see if I get a layer shift. I will try upgrading to 1.09 again and do a factory reset. I will try to pause a print.

Also on 1.08 the loading of the filament is different. On 1.07 it loads in 2 stages. You have to press done for it to pull all the filament in. With 1.08 it loads in 1 go.

I have this problem at least always on the first filament load but sometimes after a couple filament loads in a row it suddenly loads normal. It then slows down normally and also the loading happens in 2 stages again.

Very strange. But support won’t help me anymore.

20

Yeah. 1.07 is how it should work. The 1.08 video is how, in my eyes, should not work.
Also I don’t have the rubber thing on the lever, so maybe it does sound louder for me.