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Firmware.md

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Firmware 🥕

I'm using the awesome Happy Hare firmware for the ERCF. I'm sure this also works with the stock macros, but I haven't tried that. In addition, the Happy Hare [mmu_servo] works a lot better than the stock [servo] from Klipper.


Happy Hare V2.5 or newer

With Happy Hare 2.5 EREC became an official addon of the firmware. It is highly recommended setting EREC up this way, you can find more information here



Older Versions (deprecated)

Changes to mmu_software.cfg

If the [gcode_macro _MMU_POST_UNLOAD] section isnt yet defined in your mmu_sotware.cfg simply copy the whole following block into the file (there's already a section with un-loading macros). If it's already there just paste the CUTTER_ACTION Macro there

# Callback macros for modifying Happy Hare behavour
# This occurs after unloading filament on a toolchange
#
# This can be used for the Filament Cutter
# Note that restoration to original toolhead position is ensured by Happy Hare.
#
[gcode_macro _MMU_POST_UNLOAD]
description: Optional post unload routine for filament change
gcode:
    CUTTER_ACTION

Cutter config

Add this to your config. I added a file named mmu_ercf_cutter.cfg in the /config/mmu/optional to implement it with a [include mmu/optional/mmu_ercf_cutter.cfg]. Note: The Macros aren't done yet and aren't working as expected.

[mmu_servo cut_servo]         #`mmu_servo` only for the Happy Hare firmware, otherwise only `servo`
pin: mmu:PA7                  #Extra Pin on the ERCF easy Board
maximum_servo_angle: 180      #Set this to 60 for a 60° Servo
minimum_pulse_width: 0.0005   #Adapt these for your servo
maximum_pulse_width: 0.0025   #Adapt these for your servo

[gcode_macro _CUT_VAR]
description: Empty macro to store the variables

### Servo ###
variable_servo_closed_angle: 70          #Adapt these for your setup
variable_servo_open_angle: 10            #Adapt these for your setup
variable_servo_blocked_angle: 40         #I have the idea to home the filament against the cutter by blocking the filament path with 1/2 of the servo rotation. Could make cuts more precise
variable_servo_idle_time: 500            #Time to let the servo reach it's position, in milliseconds (1 second = 1000 milliseconds)

### Feed length
variable_feed_length: 48                 #Rough estimation of the parking position to the outside of the encoder
variable_cut_length: 10                  #How much you want to cut off in mm
variable_cut_amount: 1                   #Number of times the cutter tries to cut the filament

gcode:


[gcode_macro CUTTER_CLOSE]
description: Set Servo in the close position
gcode:
    {% set cutvar = printer["gcode_macro _CUT_VAR"] %}
    SET_SERVO SERVO=cut_servo ANGLE={cutvar.servo_closed_angle}
    SET_SERVO SERVO=cut_servo WIDTH=0.0
    G4 P{cutvar.servo_idle_time}
    M118 Cutter closed
    M400
    G4 P0

[gcode_macro CUTTER_OPEN]
description: Set Servo in the open position
gcode:
    {% set cutvar = printer["gcode_macro _CUT_VAR"] %}
    SET_SERVO SERVO=cut_servo ANGLE={cutvar.servo_open_angle}
    SET_SERVO SERVO=cut_servo WIDTH=0.0
    G4 P{cutvar.servo_idle_time}
    M118 Cutter open
    M400
    G4 P0

[gcode_macro CUTTER_BLOCK]
description: Set Servo in the blocked position
gcode:
    {% set cutvar = printer["gcode_macro _CUT_VAR"] %}
    SET_SERVO SERVO=cut_servo ANGLE={cutvar.servo_blocked_angle}
    SET_SERVO SERVO=cut_servo WIDTH=0.0
    G4 P{cutvar.servo_idle_time}
    M118 Cutter blocked
    M400
    G4 P0

# New Cutter Action Macro - thanks to xF4m3 and moggieuk <3
[gcode_macro CUTTER_Action]
description: Set Servo in the close position. Doesn't work properly yet.
gcode:
    {% set cutvar = printer["gcode_macro _CUT_VAR"] %}
    
    CUTTER_OPEN
    MMU_TEST_MOVE MOVE={cutvar.feed_length + cutvar.cut_length}
    {% for i in range(cutvar.cut_amount) %}
      CUTTER_CLOSE
      CUTTER_OPEN
    {% endfor %}
    MMU_TEST_MOVE MOVE=-1
    CUTTER_CLOSE
    
   _MMU_STEP_SET_FILAMENT STATE=1 
   _MMU_STEP_UNLOAD_GATE
   
    M400
    G4 P0
   


## Old Cutter Action Macro
#[gcode_macro CUTTER_Action]
#description: Set Servo in the close position. Doesn't work properly yet.
#gcode:
#    {% set cutvar = printer["gcode_macro _CUT_VAR"] %}
#
#    MMU_SERVO POS=down
#    CUTTER_OPEN
#    MMU_TEST_MOVE MOVE={44 + cutvar.cut_length} #Rough estimation of the parking position to the outout of the encoder + the cut length
#    CUTTER_CLOSE
#    CUTTER_OPEN
#    CUTTER_CLOSE
#    CUTTER_OPEN
#    MMU_TEST_MOVE MOVE=-1
#    CUTTER_CLOSE
#    MMU_EJECT
#    #MMU_SERVO POS=down
#    M400
#    G4 P0