How to improve this king of print?

Hello,

I have a question concerning my results on PLA :

How can i improve this print ?
All the printed parts are like this

Due to Z Axis issue ?

https://drive.google.com/open?id=0B0SFtfe_nXKENFhjdlRVR1k1UjQ
https://drive.google.com/open?id=0B0SFtfe_nXKEUzRjaG1DR0tUekk
https://drive.google.com/open?id=0B0SFtfe_nXKEblBobXNWUFhIUUk

Thanks.

Seb

My config :

# generated by Slic3r 1.2.9 on Fri Oct  9 23:53:17 2015
avoid_crossing_perimeters = 0
bed_shape = 0x0,200x0,200x200,0x200
bed_temperature = 50
before_layer_gcode = 
bottom_solid_layers = 3
bridge_acceleration = 0
bridge_fan_speed = 70
bridge_flow_ratio = 1
bridge_speed = 60
brim_width = 0
complete_objects = 0
cooling = 1
default_acceleration = 0
disable_fan_first_layers = 3
dont_support_bridges = 1
duplicate_distance = 6
end_gcode = M104 S0 ; turn off temperature\nG28 X0  ; home X axis\nM84     ; disable motors
external_fill_pattern = rectilinear
external_perimeter_extrusion_width = 0
external_perimeter_speed = 95%
external_perimeters_first = 0
extra_perimeters = 1
extruder_clearance_height = 20
extruder_clearance_radius = 20
extruder_offset = 0x0
extrusion_axis = E
extrusion_multiplier = 1
extrusion_width = 100%
fan_always_on = 0
fan_below_layer_time = 60
filament_colour = #FFFFFF
filament_diameter = 2.97
fill_angle = 45
fill_density = 25%
fill_pattern = honeycomb
first_layer_acceleration = 0
first_layer_bed_temperature = 50
first_layer_extrusion_width = 100%
first_layer_height = 130%
first_layer_speed = 85%
first_layer_temperature = 190
gap_fill_speed = 25
gcode_arcs = 0
gcode_comments = 0
gcode_flavor = reprap
infill_acceleration = 0
infill_every_layers = 1
infill_extruder = 1
infill_extrusion_width = 150%
infill_first = 0
infill_only_where_needed = 0
infill_overlap = 15%
infill_speed = 35
interface_shells = 0
layer_gcode = 
layer_height = 0.3
max_fan_speed = 60
max_print_speed = 60
max_volumetric_speed = 0
min_fan_speed = 35
min_print_speed = 30
min_skirt_length = 0
notes = 
nozzle_diameter = 0.5
octoprint_apikey = 
octoprint_host = 
only_retract_when_crossing_perimeters = 1
ooze_prevention = 0
output_filename_format = [input_filename_base].gcode
overhangs = 1
perimeter_acceleration = 0
perimeter_extruder = 1
perimeter_extrusion_width = 180%
perimeter_speed = 30
perimeters = 4
post_process = 
pressure_advance = 0
raft_layers = 0
resolution = 0
retract_before_travel = 2
retract_layer_change = 1
retract_length = 5
retract_length_toolchange = 10
retract_lift = 0
retract_restart_extra = 0.1
retract_restart_extra_toolchange = 0
retract_speed = 55
seam_position = random
skirt_distance = 6
skirt_height = 1
skirts = 2
slowdown_below_layer_time = 5
small_perimeter_speed = 30
solid_infill_below_area = 0
solid_infill_every_layers = 0
solid_infill_extruder = 1
solid_infill_extrusion_width = 0
solid_infill_speed = 30
spiral_vase = 0
standby_temperature_delta = -5
start_gcode = G28 ; home all axes\nG90 ; use absolute coordinates\nG21 ; set units to millimeters\nG92 E0\nM82 ; use absolute distances for extrusion\nM109 S190 ; wait for temperature to be reached\nG1 E10 F400 ; prime the nozzle
support_material = 0
support_material_angle = 0
support_material_contact_distance = 0.2
support_material_enforce_layers = 0
support_material_extruder = 1
support_material_extrusion_width = 0
support_material_interface_extruder = 1
support_material_interface_layers = 0
support_material_interface_spacing = 0
support_material_interface_speed = 100%
support_material_pattern = rectilinear
support_material_spacing = 2.5
support_material_speed = 25
support_material_threshold = 46
temperature = 190
thin_walls = 1
threads = 2
toolchange_gcode = 
top_infill_extrusion_width = 0
top_solid_infill_speed = 30
top_solid_layers = 3
travel_speed = 200
use_firmware_retraction = 0
use_relative_e_distances = 0
use_volumetric_e = 0
vibration_limit = 0
wipe = 0
xy_size_compensation = 0
z_offset = 0

Looks like your z axis isn’t running free (blocking).
Make sure it runs with as less force as possible.

A flex coupler might help.
Also, as it looks at first glance, you extrude too much material.

Yep, it’s your Z-axis. Try remove the bearing at the top. And try to print a new motor mount for the Z-rod motor. This helped me with this problem

We have a z-axis upgrade kit for the k8200 the K8204

[quote=“ichbinsnur”]Looks like your z axis isn’t running free (blocking).
Make sure it runs with as less force as possible.

A flex coupler might help.
Also, as it looks at first glance, you extrude too much material.[/quote]

A flex coupler is a necessity! Should be in the kit, in stead of the rigid coupler.

I really don’t like the idea of removing the upper bearing.
This means that all vertical load is at the flex coupler and the motor.
This is not how it’s meant to be…

Have a look at this : thingiverse.com/thing:648925

Should work also for the stock K8200 M8 threaded rod with little or no modifications.
(you won’t need the printed Nut Holder then, just reuse the stock one)