Slic3r settings for high quality, low-warp, high-strength printing of polycarbonate without an enclosure on a Prusa i3 MK2S

Polycarbonate.ini

# generated by Slic3r 1.37.2-prusa3d on Thu Dec  7 09:48:20 2017
# Figured out by trial and error engineer metacollin
# Released as public domain.	
# USE GLUESTICK FOR PRINT BED ADHESION
avoid_crossing_perimeters = 0
bed_shape = 0x0,250x0,250x210,0x210
bed_temperature = 110
before_layer_gcode = ;BEFORE_LAYER_CHANGE\n;[layer_z]\n\n
bottom_solid_layers = 8
bridge_acceleration = 1000
bridge_angle = 0
bridge_fan_speed = 40
bridge_flow_ratio = 0.8
bridge_speed = 20
brim_width = 0
clip_multipart_objects = 1
complete_objects = 0
cooling = 1
default_acceleration = 1000
deretract_speed = 30
disable_fan_first_layers = 3
dont_support_bridges = 1
duplicate_distance = 6
elefant_foot_compensation = 0
end_filament_gcode = "; Filament-specific end gcode"
end_gcode = G4 ; wait\nM104 S0 ; turn off temperature\nM140 S0 ; turn off heatbed\nM107 ; turn off fan\nG1 X0 Y200; home X axis\nM84 ; disable motors
ensure_vertical_shell_thickness = 0
external_fill_pattern = rectilinear
external_perimeter_extrusion_width = 0.6
external_perimeter_speed = 50
external_perimeters_first = 0
extra_perimeters = 0
extruder_clearance_height = 20
extruder_clearance_radius = 20
extruder_colour = #F8CE09
extruder_offset = 0x0
extrusion_axis = E
extrusion_multiplier = .93 ; You will probably need to adjust this.
extrusion_width = 0.9
fan_always_on = 0
fan_below_layer_time = 10
filament_colour = #3A80CA
filament_cost = 0
filament_density = 0
filament_diameter = 1.75
filament_max_volumetric_speed = 13
filament_notes = "Tested on eSun ePC and Priline Polycarbonate filaments.  Use gluestick for printbed adhesion."
filament_settings_id = Polycarbonate
filament_soluble = 0
filament_type = ABS
fill_angle = 45
fill_density = 40%
fill_pattern = honeycomb
first_layer_acceleration = 1000
first_layer_bed_temperature = 100
first_layer_extrusion_width = 0.6
first_layer_height = 0.2
first_layer_speed = 40
first_layer_temperature = 260
gap_fill_speed = 40
gcode_comments = 0
gcode_flavor = reprap
infill_acceleration = 2000
infill_every_layers = 1
infill_extruder = 1
infill_extrusion_width = 0.9
infill_first = 0
infill_only_where_needed = 0
infill_overlap = 7%
infill_speed = 75
interface_shells = 0
layer_gcode = ;AFTER_LAYER_CHANGE\n;[layer_z]
layer_height = 0.2
max_fan_= 20
max_layer_height = 0.25
max_print_speed = 100
max_volumetric_extrusion_rate_slope_negative = 0
max_volumetric_extrusion_rate_slope_positive = 0
max_volumetric_speed = 12
min_fan_speed = 20
min_layer_height = 0.07
min_print_speed = 3
min_skirt_length = 4
notes = "Tested on eSun ePC and Priline Polycarbonate filaments. Use gluestick for printbed adhesion."
nozzle_diameter = 0.4
octoprint_apikey = 
octoprint_host = 
only_retract_when_crossing_perimeters = 0
ooze_prevention = 0
output_filename_format = [input_filename_base].gcode
overhangs = 1
perimeter_acceleration = 800
perimeter_extruder = 1
perimeter_extrusion_width = 0.9
perimeter_speed = 65
perimeters = 4
post_process = 
print_settings_id = 0.200mm FAST LA Polycarbonate
printer_notes = "Tested on eSun ePC and Priline Polycarbonate filaments.  Use gluestick for printbed adhesion."
printer_settings_id = Original Prusa i3 MK2 - PC
raft_layers = 0
resolution = 0
retract_before_travel = 1
retract_before_wipe = 0%
retract_layer_change = 1
retract_length = 1
retract_length_toolchange = 3
retract_lift = 0.5
retract_lift_above = 1
retract_lift_below = 199
retract_restart_extra = 0
retract_restart_extra_toolchange = 0
retract_speed = 35
seam_position = random
serial_port = 
serial_speed = 115000
single_extruder_multi_material = 0
skirt_distance = 3
skirt_height = 2
skirts = 2
slowdown_below_layer_time = 15
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 = 70
spiral_vase = 0
standby_temperature_delta = -5
start_filament_gcode = "M900 K50 ; Filament gcode"
start_gcode = M115 U3.1.0 ; tell printer latest fw version\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\nG1 Y-3.0 F1000.0 ; go outside print area\nG92 E0.0\nG1 X60.0 E9.0  F1000.0 ; intro line\nG1 X100.0 E12.5  F1000.0 ; intro line\nG92 E0.0
support_material = 0
support_material_angle = 0
support_material_buildplate_only = 0
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_spacing = 3
support_material_interface_speed = 100%
support_material_pattern = rectilinear
support_material_spacing = 4
support_material_speed = 60
support_material_synchronize_layers = 0
support_material_threshold = 1
support_material_with_sheath = 0
support_material_xy_spacing = 60%
temperature = 260
thin_walls = 0
threads = 56
toolchange_gcode = 
top_infill_extrusion_width = 0.44
top_solid_infill_speed = 50
top_solid_layers = 8
travel_speed = 120
use_firmware_retraction = 0
use_relative_e_distances = 1
use_volumetric_e = 0
variable_layer_height = 0
wipe = 1
wipe_tower = 0
wipe_tower_per_color_wipe = 15
wipe_tower_width = 60
wipe_tower_x = 180
wipe_tower_y = 140
xy_size_compensation = 0
z_offset = 0

Excellent resource, thank you. Printed my first Polycarbonate part this evening, and thanks to your settings (which I used) I would have to say my first print is a 90% success. Certainly usable, and I now have a reliable starting point to play with and see whether I can squeeze a tad bit more performance out of this filament. Thanks again!

This works perfectly with eSun Polycarbonate (ePC). I used a 0.6 Nozzle with these settings otherwise stock and was able to achieve great finish with excellent layer adhesion. I will try even greater layer widths as time permits.
Thank you for sharing this with the community.
Interestingly my first test print was riddled with imperfections and the printer was making the classic popping sounds as it printed. Filament fresh out of the sealed bag was water saturated. Overnight in the dryer (food dehydrator) fixed this issue. I understand that polycarbonate is very hygroscopic (water loving) and will dry it before very use in future.

This works perfectly with eSun Polycarbonate (ePC). I used a 0.6 Nozzle with these settings otherwise stock and was able to achieve great finish with excellent layer adhesion. I will try even greater layer widths as time permits.
Thank you for sharing this with the community.
Interestingly my first test print was riddled with imperfections and the printer was making the classic popping sounds as it printed. Filament fresh out of the sealed bag was water saturated. Overnight in the dryer (food dehydrator) fixed this issue. I understand that polycarbonate is very hygroscopic (water loving) and will dry it before very use in future.

Did you use these settings on a stock printer or did you make mods to it?

Incredible! this works with my printer, a Prusa MK3s, with a 0,4 mm nozzle. I did not changed anything on the settings. Just loaded the ini and print. I made several tests before and all warped. I was already thinking of building an enclosure. I could not find a solution and it is desperately that I tested this ini file. I do not understant what you put in it, but it works. The printing is very fast. Thank's a lot Metacollin.