Yesterday, the ability to send print jobs from Bambu Handy, Bambu Studio, and LAN mode stopped working on two of my A1’s. The process stops at the download stage, and then error 0500-400B appears. Decoding the error does not lead to anything. I tried another router, tried a mobile hotspot, another SD card, tried downgrade. Nothing helps, but I’ll point out that this issue is on both printers. So it’s not about the sd card, for example. I can send a file from Bambo Studio to the sd card itself and select a file on the printer and start printing, I can see through the camera, I can control the printer, but I can’t print directly from either Bambu Studio or Bambu Handy, so as not to approach the printer
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Seems very similar to this issue.
Thanks, there’s the same error in that topic, they suggested formatting the sd card, I tried that too.
Hi! I have the same problem on my p1s printers. I also tried changing the router, turning on and off the vpn. It didn’t help! These printers just turned into a pumpkin.
any luck in a solution concerning failed downloads, I too have the same issue
So far, the following has been replied to me in support:
It’s possible that access to the cloud service is restricted.
We will report this issue to the relevant department for further investigation.
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Hi All, I have had this issues a few times. the only way I know how to fix it is to unpair your printer to the slicer and log out of your account. repair using the PIN and you should be good go to.
No. It doesn’t help. The problem is most likely in the router. I took the printer to a friend and connected everything there. The cloud started working.
What country are you in? Do you access the internet via a 4G modem?
There was a problem downloading a file. Please check your network connection and resend the print job.[0500-400B 095505]
Hi, I have such a mistake. Unplugging the printer and reconnecting it does not help. Connected to a router, the router is powered by 4G. I also connected it via the phone, the same problem.
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Are you in Russia? Is your operator Megafon or Yota?
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Looks like russian Megafon and Mts can’t resolve host for Bambu storage services. Everything is working except starting printing. Printing from slicer works only in lan mode
I can’t agree with you that the router is to blame…! I have serval other devices on the 2.4ghz network and I don’t have any issues with any of them.? Again I have also tried it connected to a phone via 5g and it still comes back with the same error, Ive looked at the windows firewall rules and this is all set to allow… And this is irrelevant as prints have gone through so again I can’t see this being a router issue…
Same situation with my A1. LAN downloads no longer auto print. You must start them from the file on the printer. Changed immediately after upgrade
I was able to solve the problem. I am in Russia and use 4G for access, we can with the operator Yota. Blocking occurs at the level of mobile network operators. I installed a VPN on my Router and sent traffic to printers through the VPN. Everything worked.
Did Bambu recently issue an update both with studio and firmware?
Mine went flaky till I reinstalled my router and reinitialized it reinserted it into the list - mines a 5G unit.
Going by what everyone is saying it points to the updates possibly?
It could also be down to that update screwing it all up, companies rarely never ever admit that it’s their fault, but it’s cured with the next update.
Old adage the more you add to a program the more can go wrong.
I hope you all get sorted…
да в России, оператор мегафон
Нужен роутер типа Кинетик. На него нужно установить xkeen и тогда все работает
I have enabled RTS on my router, this is set to 500, I can also confirm that I use the long preamble, and use WAP2 personal and I’m still having issues, I have ordered a new SD Card as I believe this is now corrupted… I have tried to send a print from the Handy app which is just a benchy and this did send but is now stuck at 2% and has been for over 10 minutes… formatting the SD Card allowed me to send this print but alas no joy…!! I will update on the issues after my SD Card is installed.
I’m having the same issue and I think it has to do with using cellular internet.
Stuck downloading then fails. I can control the printer, see the camera stream, but errors downloading files from the cloud/BambuHandy/Studio or downloading firmware from the cloud. LAN-Only works for me, same with putting files on the SD card directly. I am also using a 5G cellular modem for internet.
I think it stopped working when I changed routers. And I suspect the issue is MTU settings. When I was setting up my modem and router, I could ping sites, but couldn’t load any pages. Seems the culprit was MTU setting for my cellular provider needed an MTU of 1420. It seems possible that larger files, like gcode or firmware has too many fragmentations or something that causes it to think it works for a little while, then fails.
Contacting support, they suggested RTC/CTS set to 500 like you did. Long preamble, WPA2, and 2.4Ghz network with no firewall stuff on Bambulab ports. None of those changes worked for me. I also swapped SD cards, formatted on both the printer and a computer. Did chkdsk (which did find errors on the cards). Bought a new card. Factory reset, unbind, rebind, log out, upgrade firmware, downgrade firmware.
Then today I tried connecting my a1 to my phone hotspot and that somehow worked! Handy app was able to send a print and file downloaded in a second on my poor cellular connection. So that tells me it’s the router or modem setup.
I’m curious if yall try lowering MTU. In an OpenWRT Router, it’s in Network → Interfaces → WAN → Edit → Advanced Settings → MTU
You can use ping to find the lowest MTU that will work for your setup. Use this command in command prompt and then lower the last number until it works.
ping 8.8.8.8 -f -l 1500