3D Filament Length Estimate

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I have a Prusa Mini, so my filament selections are based on that; however, you can modify and add any type of filament as desired.

I have a 5kg load cell to get the weight of the filament. I subtract the weight of the stand (~120g) and the weight of an empty spool (~200g) from the weight before it goes to HA.

I give the length in both meters and in feet. These are estimates based on average densities of various types of filament.

### Filament Weight
- platform: mqtt
  name: "Prusa Filament Weight"
  state_topic: "filament_3d/Weight"
  json_attributes_topic: "filament_3d/Weight"
  value_template: "{{ value_json }}"
  state_class: measurement
  #device_class:
  unit_of_measurement: 'g'
  icon: mdi:weight
- platform: mqtt
  name: "Prusa Filament Percent"
  state_topic: "filament_3d/Percent"
  json_attributes_topic: "filament_3d/Percent"
  value_template: "{{ value_json }}"
  state_class: measurement
  #device_class:
  unit_of_measurement: '%'
  icon: mdi:ferris-wheel


    prusa_filament_length_metric:
      friendly_name: "Printer Filament Length"
      value_template: >-
        {% if states.sensor.prusa_connect.attributes["material"] == "PLA" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.98) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PETG" %}
          {{(states('sensor.prusa_filament_weight') | float / 3.05) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "ASA" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.52) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PC" %}
          {{(states('sensor.prusa_filament_weight') | float / 3.13) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PVB" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.64) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "ABS" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.50) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "HIPS" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.48) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PP" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.16) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "FLEX" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.91) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "---" %}
          0
        {% else %}
          0
        {% endif %}
      unit_of_measurement: 'm'
      icon_template: mdi:ruler
      availability_template: '{{ not is_state("sensor.prusa_connect", "unavailable") }}'
    prusa_filament_length_imperial:
      friendly_name: "Printer Filament Length"
      value_template: >-
        {% if states.sensor.prusa_connect.attributes["material"] == "PLA" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.98 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PETG" %}
          {{(states('sensor.prusa_filament_weight') | float / 3.05 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "ASA" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.52 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PC" %}
          {{(states('sensor.prusa_filament_weight') | float / 3.13 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PVB" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.64 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "ABS" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.50 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "HIPS" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.48 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "PP" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.16 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "FLEX" %}
          {{(states('sensor.prusa_filament_weight') | float / 2.91 * 3.28084) | round(2)}}
        {% elif states.sensor.prusa_connect.attributes["material"] == "---" %}
          0
        {% else %}
          0
        {% endif %}
      unit_of_measurement: 'ft'
      icon_template: mdi:ruler
      availability_template: '{{ not is_state("sensor.prusa_connect", "unavailable") }}'

length

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