correct, it wasn’t an inertia thing (stepper powered off), it actively moved the bed down when the resume started after power came back on. It was a semi-tall print and about 98% done, so the bed was only 80-90mm from the bottom to start with. I could understand it dropping 10-20mm while the toolhead rehomed, but this went down down down and then kept going and grinding at the bottom. There should be some feedback mechanism like the Trinamic drivers have (sensorless endstop/stall detection). Anyways I hope I don’t have to retram the bed. Did another print, small cube to test and it looks good.
BTW, I would open a bug, but in the past it got ignored (for this very same issue). So I’m just putting it out there for the community in case anyone else comes across it.
The Timelapse for some reason didn’t record the print, but a single frame from when it powered back on and bottomed out:
I can confirm the same behavior, after a power loss i clicked resume
the bed on my side went slightly down (not much) the head homed and then the print resumed but it never reraised the bed so started printing mid air…
that is the only fail print i had since i got my H2D and it happened on something that should be handled (resume after power loss seems to be handled very well except from that lowering not reraising the bed)
Looks like they pulled the changelog on the wiki, I was hoping for a firmware release soon as this AMS 2 drying mode is terrible, I keep breaking the filament trying to tuck it away because it insists. it has to rotate during drying. At 65C that is not necessary. I have 70-75C external dryers that don’t rotate and never had an issue.
There should be sensors in their for that and those many cameras inside the machine yet it’s probably not calibrated to do such tasks after power loss but should be implemented and fixed in the upcoming firmware. ( I Hope )
I agree 100% , also if you use the touchscreen, you can move the bed all the way to the top/bottom without limit which is also bad as it can cause grinding if done by mistake. There should be better coding in this machine to have a limit to where the bed can reach so that it doesn’t damage itself.
There is only one z-belt and it just keeps the 3 z-axis motors in sync. Grinding at the bottom wouldn’t cause any harm to this belt.
What could, in theory, be harmed would be the z-axis screws but I am doubtful that the motors in the H2D have enough strength to deform the z-axis screws.
They definitely could detect that it’s at its lower limit by the resistance generated - just like how they home the toolhead by pressing against the right side and back of the unit. As far as whether it’s worth it for them to do it? I don’t know.
That said - power failure resume not working isn’t good. I run mine on a Ecoflow Delta 3 Plus [as a UPS] so hopefully I won’t have to find out.
The grinding is literally the motors teeth skipping/grinding one spot on the belt, can definitely cause the belts teeth to wear down and loose its ability to grip…which is damage to the belt.
This is interesting!
Do I need to switch off LAN mode on the H2D in order to get online firmware updates since the image files for offline updating via USB stick are not available.
My H2D prompts new firmware versions available from time to time - but today I couldn’t get that prompt when I WANT to update the firmware. Even after 3 powercycles and a couple of hours waiting, printing or drying filament.
Note: I’m on firmware 01.00.01.03 which is the version it comes with.
Note 2: When I do ‘network test’ it succeeds telling me the roundtrip times for reaching ‘something’ on the internet (Step 2).
What do I need to do, to get a particular firmware version for my H2D?
Bambu Lab so far doesn’t seem to have released any H2D firmware for manual download even though they’ve advertised offline updates as a feature. For now I see no way to do an update without connecting the printer to the cloud by disabling the LAN mode.
Here is the download page for all the printers but so far without the H2D Firmware Download | Bambu Lab
I’m wondering if they are going to kill that feature on the H2D and ONLY have it available on the new enterprise version that comes out. That way enterprise will be set in stone as the ONLY real option to go with at a very high elevated price. Offline updates, ethernet port, and I would guess maybe 400* hotend or something else to distinguish it from the H2D.
I really don’t want to install the latest firmware once it comes out. I prefer to wait some time, read the internet about that firmware, and when it seems beneficial to me, I want to install it.
In most applications the way for me is downloading the latest firmware to my computer and let it sit there until I feel comfortable to install it. In the mean time new versions might arrive, but I rather be a little bit behind and therefore more save.
This strategy is almost impossible when I have to disable LAN mode and then only get the latest firmware available from Bambu Servers.
Just a guess but you may need the Bambu phone app, it’s worth a go as this might ping the servers and find a new version although saying that, you’d expect the printers to do this automatically. You may just be unlucky or maybe try temporarily setting up a hotspot on your phone, connect your printer to it and see if that jolts something to initiate a firmware update.
Is there any chance we can get the chamber light to shut off when a print is done. If a print finishes while I am gone or sleeping, the light will stay on for hours and hours. I do have energy mode on for the light. It will only shut off if I manually hit okay to confirm the print is done. Then it will shut off after the time delay.
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