Thanks.

mein Prusa Mini+ druckt ab der 4. Schicht nicht mehr richtig. Irgendwie fehlt die Haftung auf der 3. Schicht.

Hatte jemand schon mal das Problem? Kann mir einer helfen?

Gedruckt mit PLA (egal welcher Hersteller) mit, oder ohne Input Shaper, immer das gleiche Problem.

Firmware 6.4.0+11974

# generated by PrusaSlicer 2.9.4 on 2026-05-05 at 18:42:55 UTC
arc_fitting = emit_center
autoemit_temperature_commands = 1
automatic_extrusion_widths = 0
automatic_infill_combination = 0
automatic_infill_combination_max_layer_height = 100%
avoid_crossing_curled_overhangs = 0
avoid_crossing_perimeters = 0
avoid_crossing_perimeters_max_detour = 0
bed_custom_model = 
bed_custom_texture = 
bed_shape = 0x0,180x0,180x180,0x180
bed_temperature = 60
bed_temperature_extruder = 0
before_layer_gcode = ;BEFORE_LAYER_CHANGE\nG92 E0.0\n;\n\n
between_objects_gcode = 
binary_gcode = 1
bottom_fill_pattern = monotonic
bottom_solid_layers = 4
bottom_solid_min_thickness = 0.5
bridge_acceleration = 1000
bridge_angle = 0
bridge_fan_speed = 100
bridge_flow_ratio = 0.95
bridge_speed = 25
brim_separation = 0.1
brim_type = outer_only
brim_width = 0
chamber_minimal_temperature = 0
chamber_temperature = 0
color_change_gcode = M600
colorprint_heights = 
compatible_printers_condition_cummulative = "printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and printer_model==\"MINI\" and nozzle_diameter==0.4";"nozzle_diameter!=0.8 and printer_notes!~/.*PG.*/ and printer_notes!~/.*MINIIS.*/ and printer_model!=\"MK3.5\" and ! (printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and printer_notes=~/.*PRINTER_MODEL_MK(2.5|3).*/ and single_extruder_multi_material)"
complete_objects = 0
cooling = 1
cooling_perimeter_transition_distance = 0
cooling_slowdown_logic = uniform_cooling
cooling_tube_length = 5
cooling_tube_retraction = 91.5
custom_parameters_filament = ""
custom_parameters_print = 
custom_parameters_printer = 
default_acceleration = 1000
default_filament_profile = "Prusament PLA"
default_print_profile = 0.15mm QUALITY @MINI
deretract_speed = 40
disable_fan_first_layers = 1
dont_support_bridges = 0
draft_shield = disabled
duplicate_distance = 6
elefant_foot_compensation = 0.2
enable_dynamic_fan_speeds = 0
enable_dynamic_overhang_speeds = 1
end_filament_gcode = "; Filament-specific end gcode"
end_gcode = G1 E-1 F2100 ; retract\n{if layer_z < max_print_height}G1 Z{z_offset+min(max_layer_z+2, max_print_height)} F720 ; Move print head up{endif}\nG1 X178 Y178 F4200 ; park print head\n{if layer_z < max_print_height}G1 Z{z_offset+min(max_layer_z+30, max_print_height)} F720 ; Move print head further up{endif}\nG4 ; wait\nM104 S0 ; turn off temperature\nM140 S0 ; turn off heatbed\nM107 ; turn off fan\nM221 S100 ; reset flow\nM900 K0 ; reset LA\nM84 ; disable motors\n; max_layer_z = 
ensure_vertical_shell_thickness = enabled
external_perimeter_acceleration = 800
external_perimeter_extrusion_width = 0.45
external_perimeter_speed = 40
external_perimeters_first = 0
extra_loading_move = -2
extra_perimeters = 0
extra_perimeters_on_overhangs = 0
extruder_clearance_height = 20
extruder_clearance_radius = 35
extruder_colour = ""
extruder_offset = 0x0
extrusion_axis = E
extrusion_multiplier = 1
extrusion_width = 0.45
fan_always_on = 1
fan_below_layer_time = 100
filament_abrasive = 0
filament_colour = #FF8000
filament_cooling_final_speed = 3.4
filament_cooling_initial_speed = 2.2
filament_cooling_moves = 4
filament_cost = 27.99
filament_density = 1.24
filament_deretract_speed = nil
filament_diameter = 1.75
filament_infill_max_crossing_speed = 0
filament_infill_max_speed = 0
filament_load_time = 0
filament_loading_speed = 28
filament_loading_speed_start = 3
filament_max_volumetric_speed = 15
filament_minimal_purge_on_wipe_tower = 15
filament_multitool_ramming = 0
filament_multitool_ramming_flow = 10
filament_multitool_ramming_volume = 10
filament_notes = ""
filament_purge_multiplier = 100%
filament_ramming_parameters = "120 100 6.6 6.8 7.2 7.6 7.9 8.2 8.7 9.4 9.9 10.0| 0.05 6.6 0.45 6.8 0.95 7.8 1.45 8.3 1.95 9.7 2.45 10 2.95 7.6 3.45 7.6 3.95 7.6 4.45 7.6 4.95 7.6"
filament_retract_before_travel = nil
filament_retract_before_wipe = nil
filament_retract_layer_change = nil
filament_retract_length = nil
filament_retract_length_toolchange = nil
filament_retract_lift = nil
filament_retract_lift_above = nil
filament_retract_lift_below = nil
filament_retract_restart_extra = nil
filament_retract_restart_extra_toolchange = nil
filament_retract_speed = nil
filament_seam_gap_distance = nil
filament_settings_id = "Prusament PLA"
filament_shrinkage_compensation_xy = 0%
filament_shrinkage_compensation_z = 0%
filament_soluble = 0
filament_spool_weight = 278
filament_stamping_distance = 0
filament_stamping_loading_speed = 20
filament_toolchange_delay = 0
filament_travel_lift_before_obstacle = nil
filament_travel_max_lift = nil
filament_travel_ramping_lift = nil
filament_travel_slope = nil
filament_type = PLA
filament_unload_time = 0
filament_unloading_speed = 90
filament_unloading_speed_start = 100
filament_vendor = Prusa Polymers
filament_wipe = nil
fill_angle = 45
fill_density = 15%
fill_pattern = grid
first_layer_acceleration = 600
first_layer_acceleration_over_raft = 0
first_layer_bed_temperature = 60
first_layer_extrusion_width = 0.42
first_layer_height = 0.2
first_layer_infill_speed = 0
first_layer_speed = 20
first_layer_speed_over_raft = 30
first_layer_temperature = 215
full_fan_speed_layer = 4
fuzzy_skin = none
fuzzy_skin_point_dist = 0.8
fuzzy_skin_thickness = 0.3
gap_fill_enabled = 1
gap_fill_speed = 40
gcode_comments = 0
gcode_flavor = marlin2
gcode_label_objects = firmware
gcode_resolution = 0.0125
gcode_substitutions = 
high_current_on_filament_swap = 0
host_type = prusalink
idle_temperature = nil
infill_acceleration = 1500
infill_anchor = 2.5
infill_anchor_max = 12
infill_every_layers = 1
infill_extruder = 1
infill_extrusion_width = 0.45
infill_first = 0
infill_overlap = 15%
infill_speed = 140
interface_shells = 0
interlocking_beam = 0
interlocking_beam_layer_count = 2
interlocking_beam_width = 0.8
interlocking_boundary_avoidance = 2
interlocking_depth = 2
interlocking_orientation = 22.5
ironing = 0
ironing_flowrate = 15%
ironing_spacing = 0.1
ironing_speed = 15
ironing_type = top
layer_gcode = ;AFTER_LAYER_CHANGE\n;
layer_height = 0.2
machine_limits_usage = emit_to_gcode
machine_max_acceleration_e = 5000,5000
machine_max_acceleration_extruding = 2000,2000
machine_max_acceleration_retracting = 1250,1250
machine_max_acceleration_travel = 2500,2500
machine_max_acceleration_x = 2500,2500
machine_max_acceleration_y = 2500,2500
machine_max_acceleration_z = 400,400
machine_max_feedrate_e = 80,80
machine_max_feedrate_x = 180,180
machine_max_feedrate_y = 180,180
machine_max_feedrate_z = 12,12
machine_max_jerk_e = 10,10
machine_max_jerk_x = 8,8
machine_max_jerk_y = 8,8
machine_max_jerk_z = 2,2
machine_max_junction_deviation = 0,0
machine_min_extruding_rate = 0
machine_min_travel_rate = 0
max_fan_speed = 100
max_layer_height = 0.25
max_print_height = 180
max_print_speed = 150
max_volumetric_extrusion_rate_slope_negative = 0
max_volumetric_extrusion_rate_slope_positive = 0
max_volumetric_speed = 0
min_bead_width = 85%
min_fan_speed = 100
min_feature_size = 25%
min_layer_height = 0.07
min_print_speed = 15
min_skirt_length = 4
mmu_segmented_region_interlocking_depth = 0
mmu_segmented_region_max_width = 0
multimaterial_purging = 140
notes = 
nozzle_diameter = 0.4
nozzle_high_flow = 0
only_one_perimeter_first_layer = 0
only_retract_when_crossing_perimeters = 0
ooze_prevention = 0
output_filename_format = {input_filename_base}_0.4n_{layer_height}mm_{printing_filament_types}_{printer_model}_{print_time}.gcode
over_bridge_speed = 0
overhang_fan_speed_0 = 0
overhang_fan_speed_1 = 0
overhang_fan_speed_2 = 0
overhang_fan_speed_3 = 0
overhang_speed_0 = 15
overhang_speed_1 = 15
overhang_speed_2 = 20
overhang_speed_3 = 25
overhangs = 1
parking_pos_retraction = 92
pause_print_gcode = M601
perimeter_acceleration = 1000
perimeter_extruder = 1
perimeter_extrusion_width = 0.45
perimeter_generator = arachne
perimeter_speed = 50
perimeters = 2
physical_printer_settings_id = 
post_process = 
prefer_clockwise_movements = 0
print_host = 
print_settings_id = 0.20mm SPEED @MINI
printer_model = MINI
printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_PRUSA3D\nPRINTER_MODEL_MINI\n
printer_settings_id = Original Prusa MINI & MINI+
printer_technology = FFF
printer_variant = 0.4
printer_vendor = 
printhost_apikey = 
printhost_cafile = 
raft_contact_distance = 0.2
raft_expansion = 1.5
raft_first_layer_density = 90%
raft_first_layer_expansion = 3
raft_layers = 0
remaining_times = 1
resolution = 0
retract_before_travel = 1.5
retract_before_wipe = 70%
retract_layer_change = 1
retract_length = 3.2
retract_length_toolchange = 4
retract_lift = 0.2
retract_lift_above = 0
retract_lift_below = 179
retract_restart_extra = 0
retract_restart_extra_toolchange = 0
retract_speed = 70
scarf_seam_entire_loop = 0
scarf_seam_length = 20
scarf_seam_max_segment_length = 1
scarf_seam_on_inner_perimeters = 0
scarf_seam_only_on_smooth = 1
scarf_seam_placement = nowhere
scarf_seam_start_height = 0%
seam_gap_distance = 15%
seam_position = aligned
silent_mode = 1
single_extruder_multi_material = 0
single_extruder_multi_material_priming = 1
skirt_distance = 2
skirt_height = 3
skirts = 1
slice_closing_radius = 0.049
slicing_mode = regular
slowdown_below_layer_time = 12
small_perimeter_speed = 25
solid_infill_acceleration = 1500
solid_infill_below_area = 0
solid_infill_every_layers = 0
solid_infill_extruder = 1
solid_infill_extrusion_width = 0.45
solid_infill_speed = 140
spiral_vase = 0
staggered_inner_seams = 0
standby_temperature_delta = -5
start_filament_gcode = "{if printer_notes!~/.*(MK3.5|MINIIS).*/}\nM900 K{if printer_notes=~/.*PRINTER_MODEL_MINI.*/ and nozzle_diameter==0.6}0.12{elsif printer_notes=~/.*PRINTER_MODEL_MINI.*/ and nozzle_diameter==0.8}0.06{elsif printer_notes=~/.*PRINTER_MODEL_MINI.*/}0.2{elsif nozzle_diameter==0.8}0.01{elsif nozzle_diameter==0.6}0.04{else}0.05{endif} ; Filament gcode LA 1.5\n{if printer_notes=~/.*PRINTER_MODEL_MINI.*/};{elsif printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}M900 K200{elsif nozzle_diameter==0.6}M900 K18{elsif nozzle_diameter==0.8};{else}M900 K30{endif} ; Filament gcode LA 1.0\n{endif}\n\n{if printer_notes=~/.*MINIIS.*/}\nM572 S{if nozzle_diameter==0.6}0.17{elsif nozzle_diameter==0.8}0.12{elsif nozzle_diameter==0.4}0.27{elsif nozzle_diameter==0.25}0.85{else}0{endif}\n{endif}\n\n{if printer_notes=~/.*MK3.5.*/}\nM572 S{if nozzle_diameter==0.4}0.035{elsif nozzle_diameter==0.5}0.025{elsif nozzle_diameter==0.6}0.02{elsif nozzle_diameter==0.8}0.014{elsif nozzle_diameter==0.25}0.12{elsif nozzle_diameter==0.3}0.08{else}0{endif} ; Filament gcode\n{endif}"
start_gcode = M862.3 P "" ; printer model check\nG90 ; use absolute coordinates\nM83 ; extruder relative mode\nM104 S170 ; set extruder temp for bed leveling\nM140 S ; set bed temp\nM109 R170 ; wait for bed leveling temp\nM190 S ; wait for bed temp\nM204 T1250 ; set travel acceleration\nG28 ; home all without mesh bed level\nG29 ; mesh bed leveling \nM204 T ; restore travel acceleration\nM104 S ; set extruder temp\nG92 E0\nG1 Y-2 X179 F2400\nG1 Z3 F720\nM109 S ; wait for extruder temp\n\n; intro line\nG1 X170 F1000\nG1 Z0.2 F720\nG1 X110 E8 F900\nG1 X40 E10 F700\nG92 E0\n\nM221 S95 ; set flow
support_material = 0
support_material_angle = 0
support_material_auto = 1
support_material_bottom_contact_distance = 0
support_material_bottom_interface_layers = 0
support_material_buildplate_only = 0
support_material_closing_radius = 2
support_material_contact_distance = 0.2
support_material_enforce_layers = 0
support_material_extruder = 0
support_material_extrusion_width = 0.35
support_material_interface_contact_loops = 0
support_material_interface_extruder = 0
support_material_interface_layers = 2
support_material_interface_pattern = rectilinear
support_material_interface_spacing = 0.2
support_material_interface_speed = 80%
support_material_pattern = rectilinear
support_material_spacing = 2
support_material_speed = 40
support_material_style = grid
support_material_synchronize_layers = 0
support_material_threshold = 50
support_material_with_sheath = 0
support_material_xy_spacing = 60%
support_tree_angle = 40
support_tree_angle_slow = 30
support_tree_branch_diameter = 2
support_tree_branch_diameter_angle = 3
support_tree_branch_diameter_double_wall = 3
support_tree_branch_distance = 1
support_tree_tip_diameter = 0.8
support_tree_top_rate = 30%
temperature = 215
template_custom_gcode = 
thick_bridges = 0
thin_walls = 0
thumbnails = 16x16/QOI, 220x124/QOI, 200x240/QOI, 380x285/PNG
thumbnails_format = PNG
toolchange_gcode = 
top_fill_pattern = monotoniclines
top_infill_extrusion_width = 0.4
top_one_perimeter_type = none
top_solid_infill_acceleration = 800
top_solid_infill_speed = 40
top_solid_layers = 5
top_solid_min_thickness = 0.7
travel_acceleration = 0
travel_lift_before_obstacle = 0
travel_max_lift = 0
travel_ramping_lift = 0
travel_short_distance_acceleration = 0
travel_slope = 0
travel_speed = 150
travel_speed_z = 12
use_firmware_retraction = 0
use_relative_e_distances = 1
use_volumetric_e = 0
variable_layer_height = 1
wall_distribution_count = 1
wall_transition_angle = 10
wall_transition_filter_deviation = 25%
wall_transition_length = 100%
wipe = 1
wipe_into_infill = 0
wipe_into_objects = 0
wipe_tower = 0
wipe_tower_acceleration = 0
wipe_tower_bridging = 10
wipe_tower_brim_width = 2
wipe_tower_cone_angle = 0
wipe_tower_extra_flow = 100%
wipe_tower_extra_spacing = 100%
wipe_tower_extruder = 0
wipe_tower_no_sparse_layers = 0
wipe_tower_width = 60
wiping_volumes_matrix = 0
wiping_volumes_use_custom_matrix = 0
xy_size_compensation = 0
z_offset = 0

I have followed the guide and tried different ways to solve this but I cant figure out how to do this properly.
https://help.prusa3d.com/article/adjusting-belt-tension-core-one-l-core-one_845048

The gantry alignment
Okay, so I have followed the steps outlined in the "Quick gantry alignment" section which seems to be another approach compared to what is described in the parent "Alignment" section: "Loosen the bolt on the corner with play less than the other." where i have loosened it completely as suggested in the quick version.

Anyway, I bent it into shape. I think... because its unclear how to test this. So far I have put the nextruder in the middle of the gantry and then gently pushed the gantry (pushing it as centered as possible) towards the tensioners looking for gaps. First I tried to make sure it was even by pushing the left side against the tensioner and a gap showed up on the other side. Doing the same thing on the right side caused a gap at the left side. Someone in the comments on the support/guide page had the same problem which then was advised by another commenter to tighten the belts somewhat. But I question that method because tightening the belts ever so slightly can possibly at this point have the undesired side effect that with the help of the belts straighten the gantry. The gantry is somewhat flimsy by design (nothing wrong here, just an observation) so I assume that some play is to be expected?

Keeping the gantry square
When it comes to the initial tightening of the belts to keep the gantry square, how should I know how much I have to tighten the bolts? There are no visible indicators. Should I just keep turning the bolts gradually and hope for the best? I've tried to use some reference guides in an attempt to make the tensioners equally loose and from that gradually tightening them as described. Problem is that the left one will become tighter sooner than the right one causing an uneven tension on the gantry. I've seen some people suggesting that you should then only continue with the right one so that the gantry is square and rely on the tuning later on.

Belt tension
Im using the "Belt tuning wizard" and I wonder how to accurately perform this test? If the top belt starts swinging at 88Hz I can keep it going up to 96Hz and at 96.5Hz it stops. Going backwards, from lets say 98Hz and down to 96Hz it will not start swinging until i reach a lower frequency, lets say 93Hz.
This made me stop the belt (by holding it still with a finger and then letting go) at each increment and let the belt start swinging by itself without the help of the previous frequency to find out the lowest and highest Hz. This narrowed the frequency range and somewhere in this range there will be a frequency that moves the belt the most...
But what to do when the belt moves about the same at lets say 92Hz as it does at 94Hz?
Am I doing something wrong here? What would the correct procedure be?

According to the guide "On CORE One L, the ideal target frequency range is a maximum of 95 Hz for the upper belt and a minimum of 85 Hz for the lower belt."
What does this mean? Anything between 85-95Hz is good enough for both belts?
Why then is the wizard so picky about some frequencies but not others? Sometimes it says "within range, nothing to do" and sometimes it wants me to adjust the tension even though both belts are within range? What am I missing?

For the core one 96Hz is optimal for the upper belt and for the lower belt it is 92Hz. There doesnt seem to be an equivalent for the Core One L.

Sorry for all the questions but I really want to understand this.

Is anyone else experiencing this problem? I would love to find our why it happened as the error message tells me to turn off the machine and contact Prusa.

The Firefox app I also in chrome and with and without API key. Is there any trick? Or does this not work? 

Sorry the screnshot is in german.

Prusa i3mk3 is giving me a thermal runaway error and it has melted the heat shroud twice already. I have replaced 2 thermistors already and I still get the same issues after doing 5 to 10 prints. Here are some pictures of what's going on and I dont know what else to do. So I have tried running the paid calibration , and it fails immediately since thermal runaway. I am using overture p p l a default settings in prusa slicer version 2.9.5. It has been frightening fine for the last 3 to 4 months.And this just started happening about a month ago.