I just performed my first 3 month maintenance on my H2C. While cleaning and lubing the induction hot end rack I inadvertently knocked one of the hot ends off the rack and didn’t notice it. Then when trying to move the bed up and down the loose hot end got stuck between the bed and the hot end rack and this bent one of the hot end rack rails that hold the hot ends. There is only a few millimeters of clearance between these rails as they move up and down past each other and with the bent rail they wouldn’t clear each other so I kept getting errors when trying to move the bed up or down. Fortunately once I noticed the problem I was able to remove the loose hot end put it back on the rack and manually bend the bent rail back so there was sufficient clearance. This was entirely my fault due to my stupid clumsiness and not paying attention. So I’m making the post to caution others that when doing maintenance or mucking around inside the H2C make sure all the inductive hot ends are all correctly in place on the rack before moving the bed up or down. If you get an error when trying to move the bed up or down do not proceed until you have found the problem and made sure all of the inductive hot ends are in the correct positions.
Thank you for sharing your experience and words of caution. A few weeks ago I thought I had somehow lost one of my induction hotends and after looking all over the place I discovered it at the bottom of the print chamber. I must’ve bumped it at one point while wiping down my build plate. Fortunately it made it to the bottom and did not get stuck like yours. Definitely need to be careful when working near the rack and probably good practice to regularly check to ensure all hotends on the rack are staying secure. When it comes to maintenance, maybe the best thing to do is remove all the hotends on the rack and replace when maintenance is complete? Can anyone see a reason not to take that precaution?
The same thing happened to me today. Luckily, nothing was bent, but the error message puzzled me too. So, whenever you’re doing maintenance, always check that the hotends are seated correctly.
Yes, that is exactly what Bambu Labs recommends, which I did. But the next step is to clean and lube and grease the Y rods and screws, that’s where I bumped one of the hot ends off the rack, so when I tried to move the bed up and down to spread the oil and grease that’s when I caused the problem. So you just need to get into the habit of checking the rack every time you do anything inside the printer.
Sorry I meant the Z rods and screws.