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Check for Z offset in your slicer.

I think steel has more tendancy to warp, but it may be worth a try.

The above picture looks like heat creep in the extruder tube. Is the extruder fan ( not the print cooling fan ) running the...

I have had mine for a couple of weeks now. I am very happy with it. Leveled the bed and started printing right away.
Now I am using a 1/16 (0.063") aluminum plate right on top of build plate....