I'm currently calibrating the z-axis. The sound while moving the bed downwards is quite annoying and doesn't sound like everything is fine. The vibrations on the leadscrews are also very extreme - the more down the bed is, the more vibrations the leadscrews have. An impression: Youtube: https://youtu.be/AAlx5YL7gVk Original: http://content.tetrikus.com/bigbox/IMG_0305.m4v What am I doing wrong and how could I fix that one?
I can't watch the video, since I am at work, however have you tried lubricating the lead screws? If you calibrate the lead screws like the instruction say it should be a problem. However, I had vibration one time when the lead screw hit no lubrication..
Yuck! Did you follow the full bed installation process of starting with everything loose? The leadscrews could do with some lithium greese but I'm not sure that's your issue. I would take the leadscrews out, loosen the bed corner bearings and start the process again. Make sure you don't miss any steps.
Looks to me like you missed this step: http://wiki.e3d-online.com/wiki/File:Bed_measure.jpg I also can't see you left gaps here, not your current problem, but it will be easier to level the bed later : http://wiki.e3d-online.com/wiki/File:Bed_standoffs.jpg
I actually did both of them. But I guess the standoffs got screwed in while mounting the bed - isn't this what should have happened?
Having the two sides of the bed unlevel shouldn't cause that noise. I deliberately unlevel mine when I'm not in dual mode just to reduce the chance of the second nozzle hitting anything under intense vibration. It looks pretty damn level to me judging by the bed in relation to the back holes: The squeakyness is definitely just a case of needing some grease. Apply above and below the brass nut on the bed and then raise and lower to let the brass nut help distribute it. The ratcheting sound is not good. Have you tuned your stepper motors? Have you tried to figure out precisely where the noise is coming from (top, bottom, motors, etc.)?