Also do "reset to factory settings". It's in the menu. whenever you change firmware it can mess up things particularly if you don't install a newer version. If you install the same version, a sideways version, or an older version you need to do "reset to factory settings". This is the kind of thing that can be messed up. z axis steps/mm or z axis height.
Can you show a video? I want to see what you mean. It's very rare that the z axis goes faster than normal. That usually is a firmware issue.
In addition, there is a very common issue where people plug a fan into the center of the bottom of the board. If you look carefully and read what it says there, that controls the z sub stepping setting. You don't want anything on that connector - those 2 pins sticking out should be bare - no connectors, no cables.
It is also possible that your z stepper is broken or faulty but in that case it might go *down* faster than normal but not *up* as you describe it hitting the nozzle.
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fbrc8-erin 311
Is it possible you have the wrong firmware on your board? If you've got UM2X firmware on a UM2 board (the same board is used) the bed will crash into the head when it homes because it's expecting to have another 4 inches of space to move in.
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HarishEudk 0
I don't think so, it's a firmware problem. I have try to update the firmware on my UM2 still same issue.
When I connect my printer to Cura via USB and move the Z-Axis by 1mm it move more then that. No able to figure out the actual issue because when I can connected the extruder motor to in place of z axis it was working fine.
Some times the printer work fine and some times Z-Axis move too fast.
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