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========================================== Turnkey K40 Laser Arduino + Ramps Firmware

An example of this firmware in action :

Based off Marlin for 3D printers, for more info see Original credits for building this firmware from stock Marlin go to THinkscape and Lansing Makers Network and John for help with raster support. This firmware is based on their foundation work.

This firmware is designed to be used in conjunction with my Inkscape 0.91 gcode exporter

You can contact me via email at :, I check my email daily usually.


Find this software useful? Donations are gratefully appreciated.

Safety Warnings

Ensure that the Power Supply 5v rail is connected to RAMPS I2C 5v pin and that the D1 diode is removed from the RAMPS board as shown in the wiring diagram. If this pin is not connected the laser will fire when you disconnect your ramps board from USB power.


Wire your RAMPS board to your original laser end stops and laser power supply as shown in the wiring diagram in this repo.

Configuring and compilation:

Install the arduino software IDE/toolset (Some configurations also work with 1.x.x)

  • Download the Marlin firmware to your PC and extract it

  • Start the Arduino IDE.

    ** Select Tools -> Board -> Arduino Mega 2560 or your microcontroller

    ** Select the correct serial port in Tools ->Serial Port (Usually Com7 or the highest port number)

    ** Open Marlin.ino found in the 'Marlin' directory

  • Click the Verify/Compile button

  • Click the Upload button If all goes well the firmware is uploading and you'll see the led on your arduino flashing wildly. The Arduino IDE will tell you when it has finished uploading.

  • Utilise my exporter with Inkscape to design your cuts and rasters

  • Burn your eyeballs out!

Features of this repo:

  • Modified for K40 power supplies that use 'Firing Pin Signal Low' to fire.
  • Design in Inkscape, export to GCode, print!
  • Raster image support, set your own max power level and have all pixel data appropriately shifted for intensity. Defaults to 270dpi
  • Set your own feed rate in mm per minute.
  • Vector cutting of lines and arcs at your given power level.
  • Pulse Per Millimetre cutting of vector lines at your own ppm rate and power - defaults to 60us pulses.

Stock Marlin Features:

  • Interrupt based movement with real linear acceleration
  • High steprate
  • Look ahead (Keep the speed high when possible. High cornering speed)
  • Full endstop support
  • SD Card support
  • SD Card folders (works in pronterface)
  • SD Card autostart support
  • LCD support (ideally 20x4)
  • LCD menu system for autonomous SD card printing, controlled by an click-encoder.
  • EEPROM storage of e.g. max-velocity, max-acceleration, and similar variables
  • many small but handy things originating from bkubicek's fork.
  • Arc support
  • Temperature oversampling
  • Dynamic Temperature setpointing aka "AutoTemp"
  • Support for QTMarlin, a very beta GUI for PID-tuning and velocity-acceleration testing.
  • Endstop trigger reporting to the host software.
  • Updated sdcardlib
  • Heater power reporting. Useful for PID monitoring.
  • PID tuning
  • CoreXY kinematics (
  • Delta kinematics
  • Dual X-carriage support for multiple extruder systems
  • Configurable serial port to support connection of wireless adaptors.
  • Automatic operation of extruder/cold-end cooling fans based on nozzle temperature
  • RC Servo Support, specify angle or duration for continuous rotation servos.

LCD Menu:

If your hardware supports it, you can build yourself a LCD-CardReader+Click+encoder combination. It will enable you to realtime tune temperatures, accelerations, velocities, flow rates, select and print files from the SD card, preheat, disable the steppers, and do other fancy stuff. One working hardware is documented here: Also, with just a 20x4 or 16x2 display, useful data is shown.

SD card folders:

If you have an SD card reader attached to your controller, also folders work now. Listing the files in pronterface will show "/path/subpath/file.g". You can write to file in a subfolder by specifying a similar text using small letters in the path. Also, backup copies of various operating systems are hidden, as well as files not ending with ".g".

SD card folders:

If you place a file auto[0-9].g into the root of the sd card, it will be automatically executed if you boot the printer. The same file will be executed by selecting "Autostart" from the menu. First *0 will be performed, than *1 and so on. That way, you can heat up or even print automatically without user interaction.

Endstop trigger reporting:

If an endstop is hit while moving towards the endstop, the location at which the firmware thinks that the endstop was triggered is outputed on the serial port. This is useful, because the user gets a warning message. However, also tools like QTMarlin can use this for finding acceptable combinations of velocity+acceleration.

Implemented G Codes:

  • G0 -> Go to a coordinate with laser not firing
  • G1 - Coordinated Movement X Y Z E with laser firing
  • G2 - CW ARC with laser firing
  • G3 - CCW ARC with laser firing
  • G4 - Dwell S or P
  • G7 - Raster data in base64 encoding. For more info see
  • G28 - Home all Axis
  • G90 - Use Absolute Coordinates
  • G91 - Use Relative Coordinates
  • G92 - Set current position to cordinates given

M Codes

  • M0 - Unconditional stop - Wait for user to press a button on the LCD (Only if ULTRA_LCD is enabled)
  • M1 - Same as M0
  • M5 - Stop firing the laser immediately.
  • M17 - Enable/Power all stepper motors
  • M18 - Disable all stepper motors; same as M84
  • M20 - List SD card
  • M21 - Init SD card
  • M22 - Release SD card
  • M23 - Select SD file (M23 filename.g)
  • M24 - Start/resume SD print
  • M25 - Pause SD print
  • M26 - Set SD position in bytes (M26 S12345)
  • M27 - Report SD print status
  • M28 - Start SD write (M28 filename.g)
  • M29 - Stop SD write
  • M30 - Delete file from SD (M30 filename.g)
  • M31 - Output time since last M109 or SD card start to serial
  • M32 - Select file and start SD print (Can be used when printing from SD card)
  • M42 - Change pin status via gcode Use M42 Px Sy to set pin x to value y, when omitting Px the onboard led will be used.
  • M80 - Turn on Power Supply
  • M81 - Turn off Power Supply
  • M82 - Set E codes absolute (default)
  • M83 - Set E codes relative while in Absolute Coordinates (G90) mode
  • M84 - Disable steppers until next move, or use S to specify an inactivity timeout, after which the steppers will be disabled. S0 to disable the timeout.
  • M85 - Set inactivity shutdown timer with parameter S. To disable set zero (default)
  • M92 - Set axis_steps_per_unit - same syntax as G92
  • M104 - Set extruder target temp
  • M105 - Read current temp
  • M106 - Fan on
  • M107 - Fan off
  • M109 - Sxxx Wait for extruder current temp to reach target temp. Waits only when heating
  •     Rxxx Wait for extruder current temp to reach target temp. Waits when heating and cooling
  • M114 - Output current position to serial port
  • M115 - Capabilities string
  • M117 - display message
  • M119 - Output Endstop status to serial port
  • M126 - Solenoid Air Valve Open (BariCUDA support by jmil)
  • M127 - Solenoid Air Valve Closed (BariCUDA vent to atmospheric pressure by jmil)
  • M128 - EtoP Open (BariCUDA EtoP = electricity to air pressure transducer by jmil)
  • M129 - EtoP Closed (BariCUDA EtoP = electricity to air pressure transducer by jmil)
  • M140 - Set bed target temp
  • M190 - Sxxx Wait for bed current temp to reach target temp. Waits only when heating
  •     Rxxx Wait for bed current temp to reach target temp. Waits when heating and cooling
  • M200 - Set filament diameter
  • M201 - Set max acceleration in units/s^2 for print moves (M201 X1000 Y1000)
  • M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
  • M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
  • M204 - Set default acceleration: S normal moves T filament only moves (M204 S3000 T7000) im mm/sec^2 also sets minimum segment time in ms (B20000) to prevent buffer underruns and M20 minimum feedrate
  • M205 - advanced settings: minimum travel speed S=while printing T=travel only, B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk, E=maximum E jerk
  • M206 - set additional homeing offset
  • M207 - set retract length S[positive mm] F[feedrate mm/sec] Z[additional zlift/hop]
  • M208 - set recover=unretract length S[positive mm surplus to the M207 S*] F[feedrate mm/sec]
  • M209 - S<1=true/0=false> enable automatic retract detect if the slicer did not support G10/11: every normal extrude-only move will be classified as retract depending on the direction.
  • M218 - set hotend offset (in mm): T<extruder_number> X<offset_on_X> Y<offset_on_Y>
  • M220 S- set speed factor override percentage
  • M221 S- set extrude factor override percentage
  • M240 - Trigger a camera to take a photograph
  • M280 - Position an RC Servo P S<angle/microseconds>, ommit S to report back current angle
  • M300 - Play beepsound S P
  • M301 - Set PID parameters P I and D
  • M302 - Allow cold extrudes
  • M303 - PID relay autotune S sets the target temperature. (default target temperature = 150C)
  • M304 - Set bed PID parameters P I and D
  • M400 - Finish all moves
  • M500 - stores paramters in EEPROM
  • M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).
  • M502 - reverts to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
  • M503 - print the current settings (from memory not from eeprom)
  • M540 - Use S[0|1] to enable or disable the stop SD card print on endstop hit (requires ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED)
  • M600 - Pause for filament change X[pos] Y[pos] Z[relative lift] E[initial retract] L[later retract distance for removal]
  • M907 - Set digital trimpot motor current using axis codes.
  • M908 - Control digital trimpot directly.
  • M350 - Set microstepping mode.
  • M351 - Toggle MS1 MS2 pins directly.
  • M928 - Start SD logging (M928 filename.g) - ended by M29
  • M999 - Restart after being stopped by error


Marlin firmware modified and configured for LMN's inspired lasercutter



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