Temperature control

With heat bed and extruder temperature inside enclosure can rise up to 70°C. This can get issue during printing (missing motor step…). To prevent that, air flow have to be control.

As an indication of usual 3d printer ambient temperature, Prusa farm with several thousand of printer is monitoring at 40-50°C.

1. Components :

    Electrical components are describe in this page


    • Cables and soldering iron

    2. Print:

    Files are inside the ZIP file.

    2 files are available. Choose file:

    • Installation on the front panel (instead of the raspberry): “temp_control_front_panel”
    • Installation on the side panel (instead of the air vent): “temp_control_lateral”

    3. Assembly:

    2. Air flow schematics:

    Air enters the enclosure through the air entry on the bottom left of the enclosure.

    The fan is extracting hot air (with VOC compounds) out of the enclosure through the HEPA and carbon filter.

    An optional air entry can be installed in order to cool the mainboard.

    3. Mechanical assembly:

    You can choose to mount the temperature control:

    • on the front panel (black print)
    • on the right panel (orange print) instead of the air entry grid.
    Front panel version:
    Side panel version:

    If you want to keep the air entry on the side panel, use the “spacer” STL file.

    4. How to use W1219:

    W1219 manual is available on protosupplies.com

    In red: “Detection temperature” will display the temperature currently measured by the sensor.

    In green: “Setting temperature” will display the targeted temperature.

    With recommended set-up, it will work as shown below:

    Let’s say you set up 40°c:

    When “detection temperature” goes over “setting temperature” + 2°C, the fan will turn on (indicator light will be ON).

    When “detection temperature” goes below “setting temperature”, the fan will turn off (indicator light will be OFF).

    For the set-up, we recommend:

    First, long press the “set” button to enter the settings menu.

    • P0 = “C” for cooling (Heat / Cool)
    • P1 = 2°C (difference in degrees between the Trigger temp and when the relay changes state)
    • P2 = 60°C (maximum Trigger temp that can be set)
    • P3 = 35°C (minimum Trigger temp that can be set)
    • P4 = 0°C (Temperature correction)
    • P5 = 0 (Delay)
    • P6 = 60°C (Alarm)

    Long press the “set” button to go out of the settings menu.


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