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spool2klipper

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Moonraker agent to transfer Spoolman's spool's info to klipper when changing spool.

// repository documentation

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SPDX-License-Identifier: GPL-3.0-or-later
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# spool2klipper

A program that transfers info about Spoolman's data about the active Spool/Filament/Manufacturer to
[Klipper](https://www.klipper3d.org/).

The program is a [Moonraker](https://github.com/Arksine/moonraker) agent that listens for notifications
about changed spools. When the spool is changed, it asks spoolman about the changed spool's data
and it asks Moonraker to run special gcode macros in Klipper for storing data about the new spool.

## Prepare for running spool2klipper:

In the cloned repository's dir run:
```sh
python3 -m venv venv
venv/bin/pip3 install -r requirements.txt
```

## Preparing Klipper

When spool data is to be sent to Klipper, spool2klipper looks for gcode macros with the name
`_SPOOLMAN_SET_FIELD_`_fieldname_. Ie:
`_SPOOLMAN_SET_FIELD_filament_id`

The macro will be called with the argument `VALUE=`_fields-value_ which stores the _fieldname_
and _fields-value_ into the printer `save_variables`.

When a new spool is loaded, or if the active spool is ejected, this agent will call 
`_SPOOLMAN_CLEAR_FIELDS` (if available) before storing new fields. This will ensure all previously 
stored values are cleared in the event there are filaments with empty fields.

After all the macros have been called, a _MSG_ will be sent to the terminal via 
`_SPOOLMAN_DONE` if available.

Add gcode macros to Klipper's config to receive and handle the fields you are interested in.

Here's a simple example:

```ini
[gcode_macro _SPOOLMAN_SET_FIELD_filament_id]
description: Store loaded filament's ID
gcode:
  {% if params.VALUE %}
    {% set id = params.VALUE|int %}
    SAVE_VARIABLE VARIABLE=active_filament_id VALUE={id}
    RESPOND MSG="Setting active_filament_id to {id}"
  {% else %}
    {action_respond_info("Parameter 'VALUE' is required")}
  {% endif %}

[gcode_macro _SPOOLMAN_CLEAR_FIELDS]
description: Removes spool info
gcode:
    SAVE_VARIABLE VARIABLE=active_filament_id VALUE=None
    RESPOND MSG="Clearing active_filament_id"

[gcode_macro _SPOOLMAN_DONE]
description: The data was transferred
gcode:
    RESPOND TYPE=command MSG="CHANGE FILAMENT"

```

## Run automatically with systemd

Copy spool2klippper.service to `/etc/systemd/system`, then run:

```sh
sudo systemctl start spool2klipper
sudo systemctl enable spool2klipper
```

To see its status, run:
```sh
sudo systemctl status spool2klipper
```

## Automatic upgrades with Moonraker

Moonraker can be configured to help upgrade spool2klipper.

Copy the the `moonraker-spool2klipper.cfg` file to the same dir as where
`moonraker.conf` is. Include the config file by adding:
```toml
[include moonraker-spool2klipper.cfg]
```
to Moonraker's config file (moonraker.conf).

## See also

This program was made to make it easier to use [spoolman2slicer](https://github.com/bofh69/spoolman2slicer) when not using [nfc2klipper](https://github.com/bofh69/nfc2klipper).

## Developer info

Pull requests are happily accepted, but before making one make sure
the code is formatted with black and passes pylint without errors.

The code can be formatted by running `make fmt` and checked with pylint
with `make lint`.

If you add a new file, run "make reuse" to lint its licensing information.

spool2klipper

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