Ok I am starting to have serious issues with my H2D with 1k+ hours printing. My prime tower is being knocked completely over. I am tired of hearing wash your plate, don’t touch your plate - this is not adhesion issues. I even ordered a brand new plate from Bambu and it did it. Look at the pictures, I expanded the brim to 25mm and the tower was ripped right from it. I wish I could get live video to view what is happening, but clearly the print head is hitting the prime tower. I have tried with and without zhop, increased bed temp, added glue. What I really struggle with is I will get a print to work, print again without changing settings and this happens. Looking for any suggestions on what to change next.
That is 40 days straight, a lot of use in a short time.
Congratulations.
I do not have one, I want that up front, so this is general info.
That is the usual reason for bed adhesion, which is why it comes first.
I tend to agree with you here, not related.
Did you enable timelapse? One can be very helpful in this circumstance.
Consider relocating the prime tower to the back left, this makes it much closer to the poop chute and the cleaning process.
It should make travel simpler, it would also remove any bed adhesion questions as it isn’t in the same place on the bed when the model (far more fragile sits perfectly.)
I move any prime towers when I need them to the wipe/poop chute location due to travel and previous experience that had towers knocked by the head.
It is important to note, I didn’t do any tests to determine that, just moved the tower and the problem stopped. That is not conclusive, just coincidental.
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I have had similar issues lately. Where the prime tower is seems to be inconsequential.
I got very lucky in the below print. Spaghetti detection saved it and paused the print while I was asleep. As I only needed 12 more layers of nozzle swapping, I cracked the door and reached my arm in(yes I realize what the print head would do to my arm if it caught it) and held the prime tower roughly where it needed to be so the print could finish.
[Edit]: It’s obvious from the blob on top of the prime tower the head wacked it and broke it loose, then tried to extrude and caused a blob, then moved and did… WHATEVER it wanted to do.
Since it separated from the brim are you sure you are not under extruding? Do you have a USB flash drive in the machine so it can record full length videos to review?
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Relocating the prime tower is a great idea. I’d try that first too.
I had one fail in the location pictured, and another on the exact other side of the build plate(in the back).
I really need to get one. I have a NVME dock with a 256GB SSD in it that I use for shorter prints, but that’s woefully inadequate for a 8 hour print. I have been meaning to pick up a 2-4TB, I just haven’t done it yet.
So here is a previous video I have posted on YouTube with the prime tower on the left, just like @BaIto I ended up holding the prime tower in place for almost 2 hours to finish the print: https://youtu.be/RYlVBr-oHEY
It doesn’t seem to matter where I put the tower, I have time lapse of this latest print but I enabled smooth mode thinking that was possibly the problem so you don’t see the tower get knocked over.
Here are two other videos from the weekend where the prime tower was knocked over, then the 3 print just worked…
Here is the top of the prime tower if this helps… you can clearly see where the head was pushed down into the tower
Based on the first video, it appears to occur when the hot end moves to use the prime tower for the secondary filament.
Although it has been successfully used before, so, not because of using it for the first time with the secondary colour.
this looks so strange. It looks like even the layer underneath is protruding out…?
So it is hard to tell because I didn’t see what happened live, so I don’t know what happened after the collision.
Anyways I just sent the print to my P1S with out changing any settings, let’s see what happens in 24hrs…
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You can, if you have a USB stick in the H2D.
If so, remove it, and inspect the files on it - you will find a large amount of real-time, time-stamped (in the filename) video clips of the entire print duration.
Examine those video clips and you will be able to “catch it in the act”.
ETA: The H2D is always storing those files, they will fill up a large USB stick, so it’s a good idea to delete them periodically so as not to run out of storage on the USB stick.
I had the video function turned off, was only recording the Timelapse. I may have to turn it back on if I can’t find a solution
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I don’t think it would, in fact:
check this.
- Videos occupy up to 65% of the total capacity of the USB flash drive.
- 15% of the total capacity of the USB flash drive will be reserved as unused space (i.e. the total space occupied by the video files and the initial data files in the USB flash drive does not exceed 85%).
- If the initial data in the USB flash drive has occupied more than 85% of the capacity, the video function will not be enabled.
- When the free space of the USB flash drive exceeds 15%, the video function can be enabled during the printing process. The video will continue until the USB flash drive capacity reaches 85%.
- If a new video needs to be recorded for subsequent printing, the system will automatically clear the original video files in the USB flash drive to free up space.
So basically:
it won’t start video recording if the drive is nearly full
it would automatically remove some of previous recordings to keep the video usage under 65%
definitely worth it. would save a lot of time to diagnose. I once found a part that is always breaking when printing a thin pillar. Initially I blamed it on zhop, but it turned out to be mini warps on overhangs that pressed the pillar down during normal printing.
Other(s) have stated similar experience to mine - 256GB USB stick more than half filled (>130GB) by those video clips alone after ~10 hours of printing or so, for example.
It’s probably best to delete the clips after successful prints where they aren’t needed for troubleshooting weird print/printer problems 
They would delete automatically if too much memory has been used and stop automatically when it reaches 85% used
I had a Prime Tower fall over when it was too close to the purge wiper. I realized that’s not completely the same from where some pictures showed it though.
On my tall prints though recently I switched to the smooth Pei plate so that I could use glue. That seems to have helped.
This has nothing to do with space, in fact I have a 1TB HD connected. Yes by default the H2D will record full video’s of the print, however I saw this as unnecessary so I turned the function off as seen in this picture. However I am now rethinking this as I need to try and figure out what is happening and the print head is colliding with the prime tower.
