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Endless Spool

This feature is based off of Happy Hare firmware.

Requirements

To use endless spool, your printer must have one of the following:

  • A filament sensor before your printer's extruder

    Recommended

OR

  • A filament sensor before each of the 3MS's extruders

    Untested and deprecated

The endless spool feature (currently) also only works when printing single-color models.

Install

To install the endlss spool, update your 3ms/main.cfg:

3ms/main.cfg
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[save_variables]
filename: ~/printer_data/config/3ms/variables.cfg

[include ./settings.cfg]
[include ./endless/settings.cfg]
[include ./controllers/btt_skr_mini_e3_v2/steppers.cfg]

[dynamicmacros 3ms]
configs: 3ms/macros.cfg, 3ms/endless/macros.cfg

Usage

To setup endless spool, first choose which filaments can be used as backups for each other. Example with three tools:

  • T0 (PLA) -> T1(PLA)
  • T1(PLA) -> T0(PLA)
  • T2 (PETG) -> PAUSE

In this case, since T0 and T1 are backups for each other, they can be considered in the same "group" and assigned a group number. In this case, 1 will be used. Since T2 doesn't have a backup, it will be its own group. In this case, 2 will be used.

If your printer has a filament sensor before each of the 3MS's filament units, set the single setting to 0. If your printer has only one filament sensor before its main extruder, set the single setting to 1.

Edit your 3ms/endless/settings.cfg:

3ms/endless/settings.cfg
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[gcode_macro ENDLESS_SETTINGS]
single: 1 # <-- Set to 0 if you have a filament sensor before each of your 3MS extruders. Set to 1 if you have one filament sensor right before your printer's extruder.
variable_t0: 1
variable_t1: 1
### --- Uncomment below for more than two tools --- ###
variable_t2: 2
# variable_t3: -1
gcode:
    RESPOND MSG=""

Filament Sensors

If you have multiple filament sensors, change your filament sensors' runout_gcode to:

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ENDLESS_RUNOUT T=0

For the filament sensor associated with T1, change the code from T=0 to T=1, and so on.

If you have one filament sensor, change your filament sensor's runout_gcode to:

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ENDLESS_RUNOUT

Custom GCode

To define custom filament runout functionality, you can define the FILAMENT_RUNOUT macro. Example:

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[gcode_macro FILAMENT_RUNOUT]
gcode:
    RESPOND MSG="Filament runout T{params.T}!!!"

GCodes

To edit the Endless Spool state mid-print, run the SET_ENDLESS_SETTINGS command. Examples:

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; Set T0 and T1 as backups for each other, and T2 as standalone
SET_ENDLESS_SETTINGS T0=1 T1=1 T2=2

; Set T0 as standalone, and T1 and T2 as backups for each other
SET_ENDLESS_SETTINGS T0=-1 T1=1 T2=1

; Disable endless spool
SET_ENDLESS_SETTINGS ENABLED=0

; Enable endless spool
SET_ENDLESS_SETTINGS ENABLED=1

To view the Endless Spool settings, run the GET_ENDLESS_SETTINGS command.

In your slicer's print start GCode, add the following parameter to your PRINT_START macro:

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NUM_TOOLCHANGES=[total_toolchanges]

Next, in your PRINT_START macro, add the following line before your MMMS_START call:

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ENDLESS_START NUM_TOOLCHANGES={params.NUM_TOOLCHANGES}

This will ensure that Endless Spool is only enabled for single-color prints.

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