I only had one successful print, slot three has only worked once. Only using Bambu filament. I tried all of the troubleshooting I could find to no avail. I purchased the AMS for a reason, but not purchased to only be able to use slots 1, 2, and four. They are supposed to be sending me a first stage feeder. I want a new AMS, not to fix what I paid nearly 400 for and not able to use.