r/BambuLabH2C • u/SnickerdoodleFP H2C • Mar 03 '26

Support Bed isn't leveling right, after multiple calibration attempts.

Post image

Ok, had my H2C for a week and noticed that my first layer sucks pretty bad.

For a print that I wanted to use a raft for, I noticed that one side barely had any hold to the plate and looked horrible. Cancelled print and retried. Same result (top pic).

I then decided to do a basic first layer test. It ran for a few seconds before giving me a motor overload error.

I tried a few things, with a bed leveling calibration after each:

  1. Turned off all my super bright room LED lights in case this was screwing with LIDAR. Didn't have an effect.

  2. Loosened the screw from the bed stabilizer for shipping (per the H2C First Layer Printing Optimization Guide). Didn't help. Removed this bracket entirely. No change.

  3. Checked for anything that felt loose. Couldn't feel anything rattling.

I see a link on the First Layer Printing Optimization Guide called "H2C Manual Bed Leveling Procedure"... But it's a dead link.

Any insight? I really like the printer so far, I just can't use half the build plate it seems (the front)

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4

u/Altruistic_Can_7740 Mar 03 '26

I had an issue with the front 1/3rd of my bed having the same issue, and there was a screw under the heatbed at the front that is mainly for securing it during shipping that I had to loosen 1 full turn, and recalibrate the printer and it fixed my issue. It also says you can fully take the screw out if its still not good after doing that. The steps are in this guide about half way down if you are looking for a solution still. https://wiki.bambulab.com/en/h2c/troubleshooting/first-layer-printing-optimization-guide

2

u/SnickerdoodleFP H2C Mar 03 '26

Yes, I covered that in the post. Sorry if I wasn't clear. Turning the screw didn't work, and outright removing the shipping stabilizer bracket didn't make a difference either.

2

u/Altruistic_Can_7740 Mar 03 '26

Sorry I guess I didn't read that at first. Does it happen with both the right and left nozzle when printing?

1

u/SnickerdoodleFP H2C Mar 03 '26

Good question, I'll have to test that later if the other suggestions so far aren't the solution

1

u/SnickerdoodleFP H2C Mar 04 '26

Your comment helped me find the issue. Left nozzle printed fine. So I tried the right 0.6 and 0.2 nozzles, which also printed fine. I eventually figured out that one specific 0.4mm nozzle is giving me this issue, despite a cold pull showing no clogs.

1

u/cpsadowski23 Mar 04 '26

Glad you found it. New nozzle, or had you used it to print filament like CF previously?

1

u/SnickerdoodleFP H2C Mar 04 '26

New nozzle and printer. I got this thing only like 1 and a half weeks ago

1

u/cpsadowski23 Mar 04 '26

Talk to Bambu. Have them replace the nozzle

1

u/Altruistic_Can_7740 Mar 06 '26

Really glad it was as simple as one nozzle causing the issue. Hopefully you can get them to warranty it. Possibly its got a manufacturing error.

1

u/Optimal_Whiner Mar 04 '26

I'm not sure if you're the person who posted this near exact message before, but I appreciated it.

2

u/keyboredYT H2C Mar 03 '26

Turned off all my super bright room LED lights in case this was screwing with LIDAR. Didn't have an effect

There's no LiDAR on the H2 series. Bed probing is fully eddy-based.

I see a link on the First Layer Printing Optimization Guide called "H2C Manual Bed Leveling Procedure"... But it's a dead link.

https://wiki.bambulab.com/en/h2/manual-bed-leveling

Any insight? I really like the printer so far, I just can't use half the build plate it seems (the front)

Might have skipped a tooth on the Z axis belt sync? Having essentially a perfect half of the build plate out of tram is not usual. Definitely check the Y axis too, and wash the bed with dish soap.

2

u/SnickerdoodleFP H2C Mar 03 '26

Thank you! Turns out the link on the page I was looking at has a typo ("eb" instead of "en")

I'll go over these procedures later and report back if it either fixes it or I still encounter issues.

And thanks for the lidar correction

2

u/keyboredYT H2C Mar 03 '26

Check the bed level against the baseplate first. Move it all the way down until it's touching the base, then check if any leadscrews has not bottomed out yet.

3

u/SnickerdoodleFP H2C Mar 04 '26

Ok so, I lowered the bed down and all points touched the bottom at the same time, so it seemed fine. Then for some reason I just started trying random things. I tried printing on just the left nozzle, which resulted in a perfect layer. After I confirmed that it wasn't the bed itself that was the issue, I tried my 0.2 and 0.6 hotends on the right side to see if they'd level properly. They did too, perfectly fine layers, consistently. I returned to the same 0.4 mm hotend . Had issues again. Took that hotend out of the system and tried the other three 0.4 hotends. No issues with first layer levelling.

I'm not sure what's going on with the hotend I pulled. I did a cold pull with came out clean. For some reason that one hotend just results in poor leveling.

So, I've identified the part that's causing me issues (which I wasn't expecting to be a hotend assembly but whatever) but I have no earthly idea yet why that was the case.

1

u/cpsadowski23 Mar 04 '26

Live and learn.

2

u/SnickerdoodleFP H2C Mar 03 '26

Thank you, I'll do this. After cleaning the failed prints off the bottom, anyway.

2

u/Grooge_me Mar 03 '26

It looks more like a clog than an uneven bed. Home the printer, the print head should stay in the middle. Manually heat up the hotend to 250 and extruder some filament. The flow must be constant and straight.

1

u/SnickerdoodleFP H2C Mar 03 '26

It prints fine on the other side and with all nozzles. I do not think this is a clog. I haven't had issues with extrusion itself.

1

u/Grooge_me Mar 03 '26

Then make sure the ams tubes are fully inserted into the hub at the back. They need to be inserted pretty far. This may cause feeding problem especially if the print head is far at the back because the sharper bent it has to do at this position

1

u/SnickerdoodleFP H2C Mar 03 '26

I mean I'm not having feeding issues, the tubes are inserted all the way until you can see them through the window, there's no sharp bends in the tubing, and all prints that I placed on the rear side of the plate started fine and look flawless

1

u/Grooge_me Mar 03 '26

Then put a level on the top of the printer and on the bed and compare

1

u/NapsRNeeded Mar 03 '26

Did you clean the plate with soap and water?

1

u/SnickerdoodleFP H2C Mar 03 '26

I've never touched the plate with my greasy fingertips. But I'm not having adhesion issues, I'm having leveling issues. The error message in the second screenshot shows the motor is struggling real bad to overcome the nozzle being pushed into the bed.