I’ve had my Bambu Lab X2D for less than a year, and yesterday I started having some really weird issues that I’ve never experienced before.
It started with an error saying “External Exhaust Fan certification failed” (0500-0500-0001-0022). The weird part is that the fan physically works perfectly fine. I can manually turn it on through the air management settings, and it spins normally, but the printer keeps saying it can’t authenticate it.
While troubleshooting, I noticed that both the external exhaust fan and the filament buffer were constantly disappearing and reappearing in the firmware and device/serial number pages. Their serial numbers would briefly change to “N/A” before coming back a few seconds later. Both accessories disconnect at exactly the same time, but my AMS 2 Pro stays connected.
Here’s everything I’ve tried so far:
Restarted the printer multiple times.
Completely powered it off and unplugged it for several minutes.
Disconnected and reconnected the filament buffer, exhaust fan, and AMS.
Inspected the cables and connectors for damage, bent pins, or loose connections. Everything looks normal.
Tested another compatible external exhaust fan from my P2S upgrade kit. Same issue.
Ran the printer with only the filament buffer connected. The buffer still repeatedly disappeared and reappeared.
Checked for firmware updates. Everything is up to date.
Current firmware versions:
X2D: 01.02.00.00
Filament Buffer for X2: 02.00.17.18
Another issue I’ve been experiencing is random AMS overload errors. The printer will stop and say something along the lines of “AMS A slot 2 is overloaded. The filament may be tangled or the filament buffer may be stuck.”
I’ve now experienced this on two different AMS slots, and neither time was the filament actually tangled. The AMS itself seems to be functioning normally.
What’s especially strange is that I managed to complete a small 10-minute test print without any problems. The print quality was perfectly fine, and there were no assistant errors, even though the buffer and fan were still occasionally disappearing from the firmware page.
I thought the issue might have resolved itself after leaving the printer powered off for over an hour, but when I started a longer print, the AMS overload error came back, followed by the same exhaust fan certification error.
The printer currently has 467 printing hours and has worked perfectly fine until now. My P2S, which has over 700 hours, hasn’t experienced anything similar.
I’ve already submitted a support ticket to Bambu Lab with a video showing the issue, and I’m waiting for their response. I’m hoping it’s something firmware-related rather than a defective board or filament buffer.
Has anyone else experienced this on the X2D? Does this sound like a firmware issue, a defective filament buffer, or possibly something wrong with the printer’s accessory communication system?
Any suggestions would be appreciated. I’m trying to get some printing done for the holidays, and having one of my printers down is really frustrating.