For exceedingly tall high-temp prints (greater than about 265mm), the chamber heater becomes obstructed by the print bed frame, potentially leading to thermal shutdown and subsequent print failure. This code adds a macro to check the height of the bed and turns off the chamber heater before the obstruction prevents proper airflow.
Step 1. Add the following lines to the end of gcode_macro.cfg on the printer, found under the "Configuration" tab in the Fluidd interface:
[gcode_macro CHECK_CHAMBER_HEATER_Z]
gcode:
{% if (printer.toolhead.position.z) > 265 %}
M141 S5
{% endif %}
Step 2. Add the following line to the end of the "Layer change G-code" in your slicer, found in the printer profile:
CHECK_CHAMBER_HEATER_Z
Noisie Works and Redditor, Look_0ver_There who originally proposed this fix. Thank you!