I always leave video monitoring on so that when a failure occurs I can look on the USB drive and find out what happened.
I think the H2D seems to press down on a print more. I’ve noticed when it is printing an area that the area on the build plate goes down as if being pushed down but maybe that is just part of the printing process I don’t know.
Podje your Nozzle Calibration Sensor area looks like mine, people say it is missing a rubber pad that goes on it. Looks more like a nozzle wipe area than sensors.
I am not at home right now to look, but I can see what you are referring too. I will order a replacement, but struggle to see this being the issue as if the nozzle offset was calibrated wrong I wouldn’t expect to get so far along in the prints. My failures always seem to happen around the same height, so it is as if the issue occurs after a set number of layers.
ok so mine looks correct when I take a proper picture up close
Thank you for the picture I finally get to see what a real one looks like. So I guess it’s just me. I’m waiting for support to respond but I might just pay the $20 to get a new one because it’s gonna take at least 3 days for support to respond. At least that is how long it took when I put in a take for the build plate that came on the H2D being scraped on both sides w/o any machine use. I also noticed that the left aide panel of the machine was outside the frame on the bottom and I popped it back in using a small crowbar.
Here’s a good reply from another thread. I feel like it applies to your situation. Maybe you are over extruding a bit too much?
Thanks - definitely an interesting lead, and makes me feel even more like there are still issues with the way Bambu Studio is slicing prints or the AI is managing the settings on the H2D. What’s interesting, like the users in this post I have no issues with the same prints on my P1S, which unlike the X series has none of the AI sensors put it still just works. Hopefully Bambu can address these issues in the software / firmware soon.
I don’t know how tall your towers are but I just completed a 200mm print with a prime tower and that thing was stuck on like glue. I had to take the build plate out to remove it since it was flexing the build plate/bed trying to remove it. It would take significant force to knock that one over unless the head struck it at an incorrect z value.
If you look at one of the pictures, I posted the top of the prime tower - you can clearly see the head was pushed down into the tower. This is why I suspect there is an issue with the slicer and the dual had system in the H2D
Interestingly enough I had a successful print of a multicolor 6in statue of Olaf with default settings…. What was done before starting the print; factory reset, full calibration, hot ends removed and inspected, 2nd full calibration this time including the high bed temp included…
Started an even larger print tonight, fingers crossed things continue to go smooth.
I’ve had gross prime towers with every print. The glob that builds on the other nozzle while its idle, comes off on the prime tower. Eventually a glob monster will form on the prime tower that the extruder will hit, knocking it over.
Would be nice to get back to the prime tower function as a prime tower, and less of a secondary nozzle cleaner.
That shouldn’t happen, at least with the new huge prime towers. It has a part to collect the blob and make it cause less damage… Maybe record a full recording and see why it failed.
The exact same thing happened to me yesterday, xD. The last few layers of a 36-hour print and the AI camera stopped the print. So I held the tower roughly in place, to finish the job.
I guess due to either the collision or lack of pressure build up, there was a noticable layer shift and over/under extrusion during those affected layers.
As this was the second attempt at this print, I increased the size of the tower and and checked the internal ribs option, but it didn’t have much of an impact. In my case the center of the tower adhered well, but the single layer brim was not very strong. Perhaps the brim needs multiple layers to really form a solid bond to the plate? But I’m not sure if that’s possible in the slicer currently. Either way, I hope the prime tower gets revisited in future updates, since it seems like a software issue.
The head is not pushed down into the tower, but the tower comes up when it is tilted. That is causing the dents in the top of the tower.
So while I would agree that this is plausible and I have seen it happen in the past on some of my prints while troubleshooting, my concerns with the latest ones you can see in the picture that the indent is perfectly vertically aligned with the tower. When the issue occurs with the tower getting tilted the indent looks different, I don’t have a picture to show this but I have seen it.
It would be interesting to know how deep the indent is and how wide your wipe-tower is. Then we can calculate the amount of tilt the tower needs to have to create such an indent.
My advice is to install a USB-stick and make a video of the event. Basically excludes all guesses about the issue.
So an update to this.
I was unaware that as long as you had a USB drive on the printer it was recording full length videos. It turns out I do indeed have a video of the failure.
And have you been able to isolate the cause of your failure?
I haven’t. I haven’t printed anything that tall that’s needed a prime tower recently.