MK4S MMU3 Overature PETG settings help?  

RE: MK4S MMU3 Overature PETG settings help?

It doesn't look like the settings file was added. Weird, I put it in the "Attach file" part. Anyway, here are the settings I used for the MK4 that used to work:

# generated by PrusaSlicer 2.7.1+win64 on 2024-01-08 at 15:19:35 UTC

bed_temperature = 90

bridge_fan_speed = 50

compatible_printers =

compatible_printers_condition = printer_notes=~/.*MK4.*/ and printer_notes!~/.*MK4IS.*/ and nozzle_diameter[0]!=0.8 and nozzle_diameter[0]!=0.6

compatible_prints =

compatible_prints_condition =

cooling = 1

disable_fan_first_layers = 3

enable_dynamic_fan_speeds = 0

end_filament_gcode = "; Filament-specific end gcode"

extrusion_multiplier = 1

fan_always_on = 1

fan_below_layer_time = 20

filament_colour = #FF8000

filament_cooling_final_speed = 1

filament_cooling_initial_speed = 2

filament_cooling_moves = 1

filament_cost = 27.82

filament_density = 1.27

filament_deretract_speed = nil

filament_diameter = 1.75

filament_load_time = 15

filament_loading_speed = 14

filament_loading_speed_start = 19

filament_max_volumetric_speed = 10

filament_minimal_purge_on_wipe_tower = 35

filament_multitool_ramming = 0

filament_multitool_ramming_flow = 10

filament_multitool_ramming_volume = 10

filament_notes = ""

filament_ramming_parameters = "120 140 4.70968 4.74194 4.77419 4.80645 4.83871 4.87097 4.90323 5 5.25806 5.67742 6.29032 7.06452 7.83871 8.3871| 0.05 4.72901 0.45 4.73545 0.95 4.83226 1.45 4.88067 1.95 5.05483 2.45 5.93553 2.95 7.53556 3.45 8.6323 3.95 7.6 4.45 7.6 4.95 7.6"

filament_retract_before_travel = nil

filament_retract_before_wipe = 0%

filament_retract_layer_change = nil

filament_retract_length = 1

filament_retract_length_toolchange = nil

filament_retract_lift = 0.15

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_settings_id = ""

filament_soluble = 0

filament_spool_weight = 0

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 = PETG

filament_unload_time = 12

filament_unloading_speed = 20

filament_unloading_speed_start = 120

filament_vendor = Generic

filament_wipe = nil

first_layer_bed_temperature = 85

first_layer_temperature = 230

full_fan_speed_layer = 5

idle_temperature = 70

inherits = Generic PETG @PG

max_fan_speed = 50

min_fan_speed = 30

min_print_speed = 15

overhang_fan_speed_0 = 0

overhang_fan_speed_1 = 0

overhang_fan_speed_2 = 0

overhang_fan_speed_3 = 0

slowdown_below_layer_time = 9

start_filament_gcode = "M900 K{if nozzle_diameter[0]==0.4}0.07{elsif nozzle_diameter[0]==0.25}0.12{elsif nozzle_diameter[0]==0.3}0.09{elsif nozzle_diameter[0]==0.35}0.08{elsif nozzle_diameter[0]==0.6}0.04{elsif nozzle_diameter[0]==0.5}0.05{elsif nozzle_diameter[0]==0.8}0.02{else}0{endif} ; Filament gcode\n\n{if printer_notes=~/.*(MK4IS|XLIS).*/}\nM572 S{if nozzle_diameter[0]==0.4}0.055{elsif nozzle_diameter[0]==0.5}0.042{elsif nozzle_diameter[0]==0.6}0.032{elsif nozzle_diameter[0]==0.8}0.018{elsif nozzle_diameter[0]==0.25}0.18{elsif nozzle_diameter[0]==0.3}0.1{else}0{endif} ; Filament gcode\n{endif}\n\nM142 S36 ; set heatbreak target temp"

temperature = 220

RE: MK4S MMU3 Overature PETG settings help?

Just use the prusament PETG profile.  It's worked good for me with many different PETG filaments. 

RE: MK4S MMU3 Overature PETG settings help?

It runs way too hot, unfortunately. I've tried adjusting it to work with Overature, but wound up just modifying the "Generic PETG" profile for the MK4. After many tries with the MK4S + MMU3, I can't get it to play nicely. 

RE:

This is the most "successful" print yet.

ail_in_one_3d_printer_test_nano

RE:

I just printed these tonight using the Prusament profile, Hatchbox PETG filament, .2mm structural with lowering the temp to 240.  This is with doing nothing to the part.  This is exactly how it came off the printer 

I print with some silver Overature occasionally using the same settings with the same results. 

Is your filament dry?

And those are scratches in my table, not strings.  There is zero stringing.

RE: MK4S MMU3 Overature PETG settings help?

Do you have the same setup as I do? MK4S with the MMU3? Your picture is very similar to how my Overature PETG prints used to look before these upgrades using the settings I listed earlier.

Currently, I am trying to calibrate the printer for this filament using the "0.10mm FAST DETAIL" default presetting. Only adjusting the filament settings. 

RE: MK4S MMU3 Overature PETG settings help?

No MMU, but I don't believe that had anything to do with what you're experiencing.  I suspect wet filament combined with bad print settings. 

Are you using the Stock MK4S Inputshaping Printer profile? 

RE: MK4S MMU3 Overature PETG settings help?

The MK4S MMU3 uses the MK4 nozzle, not the MK4S high flow nozzle (as per the installation instructions). I am using the stock profiles for everything except the filament, which is a modified "Generic PETG" profile. 

RE: MK4S MMU3 Overature PETG settings help?

There is a non HF Prusament setting.  You should be able to use that.  

RE: MK4S MMU3 Overature PETG settings help?

I am using that. I have set up the printer exactly how the upgrade instructions said to. I was able to calibrate this and other filaments in two or three tries with the MK3 - MK4 versions, but I'm currently printing try 11 with the MK4S MMU3.

RE: MK4S MMU3 Overature PETG settings help?

I keep forgetting to answer your "old filament" question. No, not old, I just opened it for this calibration. I learned the hard way not to calibrate with old filament years ago. 

RE: MK4S MMU3 Overature PETG settings help?

Always remember with PETG: "just opened" and "fresh out of the bag" does not automatically mean that it is dry enough for printing! You should dry it first. Your print in the photo looks like the filament was not dry enough. Why do people first try to change all possible settings in the slicer, waste a lot of time and filament, before they start with drying the filament?

RE: MK4S MMU3 Overature PETG settings help?

I honed it in. It was a settings issue. Even pulled another spool out to verify and it worked for about a day. I have printed with this filament pretty much exclusively for the past few years. I know it well.

I woke up this morning to a blob that destroyed my hotend and fan duct. I have been 3D printing (at least two or three prints a week) since 2015 and have had a lot of problems with other printers until I finally bought a Prusa. The Prusa MK3 was my fifth FDM printer and I never turned back. However now I am considering a Bambu. I feel like the MK4S was a hastily slapped together upgrade to compete and it is causing problems. I have only had a blob one other time on my Prusa (years ago) and it was user error. Now with the MMU3 and MK4S upgrades, I am having nothing but problems. 

I have to wait til Monday to get the replacement parts before I can continue printing...

RE: MK4S MMU3 Overature PETG settings help?

Too bad. 

I still think it's a setup issue of some sort.  You see the quality of my prints and I have almost zero issues with my many Prusa Machines.  The MK4 has been a great trouble free machine for me, and even after the MK4S upgrade I've had no issues. 

I'd be interested to see a 3MF file with your settings.  Would you care to upload one?

If not good luck in your search for trouble free printing.