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Marlin 2 Configurations

Configurations for UMO+, UM2, UM2+ merged upstream to MarlinFirmware/Configurations are available at: MarlinFirmware/Configurations

These configurations are automatically merged with Configuration file version updates so accuracy is not guaranteed. All configurations can be used on single extruder printers by changing the extruder count from 2 to 1 and commenting out the multi extruder, thermistor, and extruder defines.

PID Values Calibration

Determine your own PID by running M303 or use the below values as reference.

Hotend PID values using 35 W heater cartridge

Printhead PID values in Gcode. Save to EEPROM with M500
Stock UM2+ M301 P8.86 I0.68 D28.86
DXU PTFE with PI spacer M301 P13.95 I1.77 D27.42
DXU all-metal M301 P10.85 I1.08 D27.33
DXUv2 non-lifting nozzle (left) M301 E0 P15.15 I1.78 D32.26
DXUv2 lifting nozzle (left) M301 E1 P15.53 I1.79 D33.71

Heated bed PID values using Ultimaker 120 W heated bed

Printhead PID values in Gcode. Save to EEPROM with M500
Stock UM glass bed M304 P124.55 I23.46 D165.29
Textured PEI on magnetic metal sheet M304 D372.47 I14.05 P88.61

EStep (steps/mm) Calibration

Determine your extruder steps/mm to avoid over/under extrusion. Even stock and clone extruders have variances that deviate from default steps/mm values!

Extruder steps/mm with 1.8°/step (UMO+/UM2+ extruder motor) steps/mm with 0.9°/step (UM2 extruder motor)
UM2+ Extruder M92 E369 M92 E738
UM2+ Extruder (aliexpress) M92 E357 - M92 E360 M92 E715 - M92 E720
  1. Disconnect bowden tube and printhead from extruder.
  2. Disable Cold Extrude protection. M302 P1
  3. Set current extruder position in software to 0. G92 E0
  4. Feed filament into extruder. Mark the location on the filament that sticks out from the extruder filament output hole using a sharpie.
  5. Move 100 mm of filament forward. G0 E100 F100
  6. Mark location of filament that sticks out from the extruder filament output hole.
  7. Measure distance between markings to determine actual distance of filament moved forward.
  8. Calculate correct steps/mm manually or corrected esteps = current esteps * (actual distance in mm)/100mm or use TH3D EStep Calculator
  9. Set new steps/mm M92 E<esteps> e.g. M92 E369.
  10. Return to step 3 and verify 100m of filament is actually moved.

Hotend Offset Calibration

Stock hotend offset values for the second extruder are M218 T1 X18 Y0 Z-2 Stock probe offset values are NOZZLE_TO_PROBE_OFFSET { 9, -19.5, -1 }

Hotend Offset X/Y Calibration

  1. Print dual X/Y calibration print here or in the AL-Hotend Calibration folder.
  2. Compare print results and set hotend offsets with M218. M218 T1 XNNN YNNN

Hotend Offset Z Calibration

  1. Switch to first extruder. T0
  2. Home Z axis. Optionally home X/Y axis and move printhead to center of X/Y. G28 G0 X100 Y100
  3. Move Z axis to 0 position where nozzle touches or is ~0.1 mm above the bed for the paper calibration method. Using a piece of paper/gauge sliding between nozzle and bed, note the physical distance (not the value on the screen) between the nozzle and bed at Z0. G0 Z0
  4. Move Z axis down at least 5 mm to make space for the second extruder. G0 Z5
  5. Manually activate second extruder with your hand or a tool. Do not activate with toolchange gcode T1 unless the HOTEND_OFFSET_Z for the second extruder is set to 0.
  6. Move Z axis up until the physical distance between the second nozzle and bed are the same as the physical distance between the first nozzle and bed that you remembered earlier. Use a paper/gauge to get the right distance. Use the negative values of the Z position reported by the printer software as the HOTEND_OFFSET_Z for the second extruder. E.g. If the reported Z position is 2.5 mm, use -2.5 mm.
  7. Set new hotend Z offset with M218. M218 T1 ZNNNN

Toolchange G-code

The movement commands to switch between the extruders can be set in firmware or the slicer. I recommend setting this in firmware rather than in the slicer. This way the toolchange action and offset compensation is completely handled by firmware and you do not need to remember to set up the special movements and offsets in every slicer you use (if the slicer even has support for it). When the toolchange is set in the firmware, all that is needed to change a tool is calling TXX where XX is the new extruder index starting from 0.

Configuration macros to change in Marlin are EVENT_GCODE_TOOLCHANGE_T0 and EVENT_GCODE_TOOLCHANGE_T1. All movements are based off of hotend 0's offset which should be 0,0,0. Otherwise there would be no way to know which hotend offset is being switched from if there are more than 2 hotends. Marlin will translate the movement by the current hotend offset.

Printer Case Extruder Toolchange G-code
UM2/UM2+ T0 G90\nG0 X214 F7200\nG0 Y178\nG0 X219 F1800\nG0 Y194.5\nG0 X214\nG0 Y169 F7200
UM2/UM2+ T1 G90\nG0 X214 F7200\nG0 Y209\nG0 X220 F1800\nG0 Y193\nG0 X214\nG0 Y169 F7200
UMO+ T0 G90\nG0 X211 F7200\nG0 Y167\nG0 X217 F1800\nG0 Y182\nG0 X211\nG0 Y166 F7200
UMO+ T1 G90\nG0 X211 F7200\nG0 Y198\nG0 X219 F1800\nG0 Y181\nG0 X211\nG0 Y166 F7200

Save Printer Settings

Save settings to persistent storage on board the printer EEPROM with M500

Marlin 2 Firmware

Firmware source code customized for 3D printers

Machine style Motherboard (controller board) Firmware source code branch
UMO+/UM2/UM2+ w/ DXU ULTIMAINBOARD ansonl/Marlin:dxu-ultimaker-ultimainboard-2
UMO+/UM2/UM2+ w/ DXU BTT_OCTOPUS_PRO_V1_0 ansonl/Marlin:dxu-ultimaker-btt-octopus-pro-1

If you have a modified Marlin 2 firmware that you would like to add to this list, please add it in a PR.

Firmware notes for each branch versus MarlinFirmware/Marlin upstream

ansonl/Marlin:dxu-ultimaker-ultimainboard-2

ansonl/Marlin:dxu-ultimaker-btt-octopus-pro-1

  • Pins changes
    • pins_BTT_OCTOPUS_PRO_V1_0.h
    • pins_BTT_OCTOPUS_V1_common.h
  • MarlinFirmware/Marlin#25683 - OTA Firmware update via SDIO card update

Merged to upstream

Cura printer settings

"overrides":
    {
        "line_width": { "value": "machine_nozzle_size" },
        "machine_depth": { "default_value": 216 },
        "machine_disallowed_areas":
        {
            "default_value": [
                [
                    [100, -102.5],
                    [110, -102.5],
                    [110, -62.5],
                    [100, -62.5]
                ]
            ]
        },
        "machine_end_gcode": { "value": "\"\"  if machine_gcode_flavor == \"UltiGCode\" else \"G91 ;Relative movement\\nG0 X-8.0 Y-8.0 Z3.5 E-4.5 F18000 ;Wiping+material retraction ;increase bed lower 0.5>5.0 and add Y movement\\nG0 F10000 Z1.5 E4.5 ;Compensation for the retraction\\nG90 ;Disable relative movement\\nM400 ;wait for all moves in planner to complete\\nG90 ;absolute positioning\\nM104 S0 T0 ;extruder heater off\\nM104 S0 T1\\nM140 S0 ;turn off bed\\nT0 ; move to the first head\\nG27; park toolhead\\nM107 ;fan off\\nM355 S0;turn off case light\"" },
        "machine_extruder_count": { "default_value": 1 },
        "machine_gcode_flavor": { "default_value": "RepRap (Marlin/Sprinter)" },
        "machine_head_with_fans_polygon":
        {
            "default_value": [
                [-46, 30],
                [-46, -34],
                [66, 30],
                [66, -34]
            ]
        },
        "machine_heat_zone_length": { "default_value": 20 },
        "machine_heated_bed": { "default_value": true },
        "machine_height": { "default_value": 208 },
        "machine_max_feedrate_x": { "default_value": 300 },
        "machine_max_feedrate_y": { "default_value": 300 },
        "machine_max_feedrate_z": { "default_value": 40 },
        "machine_min_cool_heat_time_window": { "default_value": 15.0 },
        "machine_name": { "default_value": "dxu2" },
        "machine_nozzle_cool_down_speed": { "default_value": 0.8 },
        "machine_nozzle_expansion_angle": { "default_value": 45 },
        "machine_nozzle_head_distance": { "default_value": 3 },
        "machine_nozzle_heat_up_speed": { "default_value": 1.4 },
        "machine_nozzle_size": { "default_value": 0.4 },
        "machine_start_gcode": { "value": "\"\"  if machine_gcode_flavor == \"UltiGCode\" else \"; DXUv2 improved start priming Gcode for dual nozzles for single material print by ansonl\\nM355 S1 P25 ; Turn on case light dim\\nM190 S{material_bed_temperature_layer_0}\\nG28 ; Home all\\nG29 ; Run automatic bed leveling. Comment this line out if auto bed leveling is not desired.\\nM104 T0 S{material_standby_temperature, 0} ; Preheat T0 to standby temp\\nG21 ; Metric values\\nG90 ; Absolute positioning\\nM82 ; Set extruder to absolute mode\\nM107 ; Start with the fan off\\nM200 D0 T{initial_extruder_nr} ; Reset filament diameter\\nG0 X200 F7200 ; move to safe X and Y location from right side after ending ABL homing\\nG1 Y150 F7200\\nM104 T{initial_extruder_nr} S{material_print_temperature_layer_0, initial_extruder_nr}\\nT{initial_extruder_nr} ;switch to the first nozzle used for print\\nM400 ;finish all moves\\nG0 Z20 F2400\\nG0 X214 F18000\\nG0 Y2 F18000\\nM109 T{initial_extruder_nr} S{material_print_temperature_layer_0, initial_extruder_nr}\\n;Final wipe sequence for initial extruder\\nG0 X212 Z0.3 F600\\nG92 E05\\nG1 Y45 E6.5 F1000\\nG92 E0\\nG1 E-0.5 F1500 ; retract\\nG92 E0\\nG1 Y100 F18000\\n;end of startup sequence\\n\\nM355 S1 P50;turn on case light\"" },
        "machine_use_extruder_offset_to_offset_coords": { "default_value": false },
        "machine_width": { "default_value": 221 },
        "material_adhesion_tendency": { "enabled": true },
        "material_diameter": { "default_value": 1.75 },
        "prime_tower_position_x": { "value": "180" },
        "prime_tower_position_y": { "value": "160" },
        "retraction_amount": { "default_value": 3 },
        "retraction_min_travel": { "value": "line_width * 2" },
        "retraction_speed": { "default_value": 25 },
        "switch_extruder_prime_speed": { "value": "retraction_prime_speed" },
        "switch_extruder_retraction_amount": { "value": "retraction_amount" },
        "switch_extruder_retraction_speed": { "value": "retraction_retract_speed" },
        "switch_extruder_retraction_speeds": { "value": "retraction_speed" },
        "travel_avoid_distance": { "value": "3 if extruders_enabled_count > 1 else machine_nozzle_tip_outer_diameter / 2 * 1.5" }
    }