Waves in the Z axis

Hello,

I have a printer Prusa.

I made the change of the filament 3 mm by 1.75 mm but I have a problem I can not solve, the model have waves in the Z axis. The layers more "extrude" the other layers. As shown in the picture attached.



I use the Cura as slicing and settings are as follows:

layer_height = 0.075
wall_thickness = 1.2
retraction_enable = True
solid_layer_thickness = 0.6
fill_density = 30
nozzle_size = 0.4
print_speed = 10
print_temperature = 230
print_temperature2 = 0
print_temperature3 = 0
print_temperature4 = 0
print_bed_temperature = 110
support = None
platform_adhesion = None
support_dual_extrusion = False
wipe_tower = False
wipe_tower_volume = 15
ooze_shield = False
filament_diameter = 1.75
filament_diameter2 = 0
filament_diameter3 = 0
filament_diameter4 = 0
filament_flow = 100
retraction_speed = 40
retraction_amount = 5.0
retraction_dual_amount = 16.5
retraction_min_travel = 1
retraction_combing = True
retraction_minimal_extrusion = 0.01
retraction_hop = 0.0
bottom_thickness = 0.0
layer0_width_factor = 100
object_sink = 0.0
overlap_dual = 0.15
travel_speed = 100
bottom_layer_speed = 10
infill_speed = 30
inset0_speed = 0.0
insetx_speed = 0.0
cool_min_layer_time = 0
fan_enabled = True
skirt_line_count = 3
skirt_gap = 3.0
skirt_minimal_length = 150.0
fan_full_height = 0.5
fan_speed = 100
fan_speed_max = 100
cool_min_feedrate = 10
cool_head_lift = False
solid_top = True
solid_bottom = True
fill_overlap = 15
support_type = Grid
support_angle = 60
support_fill_rate = 15
support_xy_distance = 0.7
support_z_distance = 0.15
spiralize = False
simple_mode = False
brim_line_count = 15
raft_margin = 5
raft_line_spacing = 1.0
raft_base_thickness = 0.3
raft_base_linewidth = 0.7
raft_interface_thickness = 0.2
raft_interface_linewidth = 0.2
raft_airgap = 0.22
raft_surface_layers = 2
fix_horrible_union_all_type_a = True
fix_horrible_union_all_type_b = False
fix_horrible_use_open_bits = False
fix_horrible_extensive_stitching = False


By the printer settings I use:
Acceleration: 200 in the X and Y and Z in 100
Steps / mm: 95
Jerk: 16.0
Z-Jerk: 0.2

Sorry my bad english
Klaus Maximilian

I am assuming you switched from 3mm feedstock to 1.75mm feedstock?


can you show a picture of your machine? it may be in your case the extra force required to pull the feed stock could be slightly lifting the z axis. in this case a piece of tubing about 1 foot long inserted between the extruder and the feedstock would help. since no heat is applied to this section, and only concern is friction, about any solid tubing would do from a hardware store, so long as it is >2.5mm internal diameter.

if this does not work, then there are other things to check, but if the only differences are hot end and the feedstock I would look at the feedstock force. 3.14*3mm=9.42, 3.14*1.75mm 5.495, 9.42/5.495, there is about ~1.7 times the pulling force from the feedstock just from the faster speed, then there is frictional force from how tight it is wound. keep also in mind that 1.75mm feedstock also gets tangled easily.



there are several issues that could effect z wobble if you did not have it before, 1 inaccurate flow rate, too high a temp, wobble in extruder, loose belts on any axis, wires or any obstruction rubbing against axis bars, not re-lubing axis after working on it and touching it with hands,glue,dirt,sand, or any other material, slipping teeth in extruder gears, under-powered motor for extruder, and bent z axis rods, or motor coupler slipping, and several other possible things.

anyway post images of your extruder, showing the placement of wires around the x carriage, also show a detailed image of the entire printer, and show a picture of the feedstock and the roll it is on. someone will help you figure it out!

Edited 2 time(s). Last edit at 12/20/2014 01:26PM by jamesdanielv.

Thank jamesdanielv

Sorry I did not understand all that said because I am new in 3D printer.
I'm putting here the printer photo to help in solving this problem.
If you need any more information, I am available.