Find out if your z-axes of your printer works well...
Its nice to find out the perfekt temperatures for your printer for better results. (0.45/210/70) PLA works well

layer_height = 0.2
; perimeters = 3
; top_solid_layers = 3
; bottom_solid_layers = 3
; fill_density = 0.4
; perimeter_speed = 20
; infill_speed = 40
; travel_speed = 150
; nozzle_diameter = 0.45
; filament_diameter = 2.9
; extrusion_multiplier = 1
; perimeters extrusion width = 0.77mm
; infill extrusion width = 0.84mm
; solid infill extrusion width = 0.77mm
; top infill extrusion width = 0.77mm
; first layer extrusion width = 0.90mm