The fan that vents outside? Set the temp to something like 100°c. Don’t want that running while heating the chamber at the same time.
Fan2 is the internal auxiliary part cooling fan. While the chamber heater is doing it’s initial heating, it is running at 100%. Overkill, and quite loud.
The Exhaust Fan is the one that vents externally, and yes, it needs to be set higher than the chamber heater. Problem is, I haven’t found a way to do that in the slicer, which means I have to set it manually in Mainsail for every print.
Hello,
I don’t know if this will help, but you can modify the start/end gcode to adapt each print to your needs.
and i thought i was the only one with the problem
luckily i seem to have found a workaround which seems to be working for me so far (still very fresh, so i’m still quite cautious with my celebrations)
what’s everyone’s thoughts on PID tuning their chamber with the chamber heater? Watermark is default with a max_ delta of 1.0 and it seems okay but pid may be more on point to the requested temp. Or would the heated bed and nozzle constantly interfere with its tuning
A couple of mods I’ve made to the M191 macro in chamber_hot.cfg
TLDR: Set exhaust fan temp to chamber+5, Set aux part fan to 0, Enable bed heater to assist initial heating
[gcode_macro M191]
gcode:
{% set s = params.S|float %}
{% if s == 0 %}
# If target temperature is 0, do nothing
M117 Chamber heating cancelled
{% else %}
# Set exhaust fan temp to 5 degrees above chamber heat target
# If you don’t do this, the exhaust fan starts a death-match with the chamber heater
SET_TEMPERATURE_FAN_TARGET TEMPERATURE_FAN=exhaust_fan TARGET={s+5}
SET_HEATER_TEMPERATURE HEATER=chamber_heater TARGET={s}
# Set fan2 (aux part cooling fan) to zero. No f’in idea why the above macro sets it to 100
SET_FAN_SPEED FAN=fan2 SPEED=0.00
# Orca: uncomment the following line if you want to use heat bed to assist chamber heating
M140 S100
TEMPERATURE_WAIT SENSOR=“heater_generic chamber_heater” MINIMUM={s-1} MAXIMUM={s+2}
M117 Chamber at target temperature
{% endif %}
Depending on your filament and filtration posture, you should probably still have some exhaust to keep the chamber at negative pressure, pulling fresh air in through the seams so fines and fumes don’t leak out instead. Yes, this does waste a little heat, but the minimum fan speed can be easily improved beyond the stock 20%. I managed to get it down to 12%. PID Controlled Exhaust Fan (Quiet!) - #8 by rpcyan
Conversely, it would be reasonable to not have any exhaust during the pre-heating phase, and only begin ventilating once filament is being extruded
oh, and if the toolhead is near the bed, having fan2 blowing on the bed helps move the bed’s heat and put it into the air. The bed has more wattage than the chamber heater (250W/1kW depending on 110v/220v) but is quickly throttled even at maximum setpoint.
I agree 100% is obnoxiously loud, but assuming the bed is in fact in a reasonable position, I would set fan2 to a comfortable level to accelerate the chamber preheating, and result in a more even heat