Why are my layers messy and curling off the print bed?
This is clearly overextrusion relative to the volume the material is being deposited into, but that doesn't necessarily mean your extrusion rate is wrong. It could be:


Nozzle smashed down into the bed (bed way too high) but somehow still extruding
Problem in Z axis movement preventing the head from moving up the right amount for each layer (possibly not moving up at all?)
Extrusion (flow) increased significantly above 100% in slicer
Wrong extruder steps/mm setting (usually controlled on printer not slicer, though you can send a setting in the start gcode)
Misconfigued filament diameter (unlikely since there's no common setting smaller than 1.75 mm; larger setting would under-extrude)