I have never seen the mode 2 and 3 (pictures) only mode 1 for many prints - I took the inside vent cover off to see the blocker moves up and down in action.
Printing ASA and heated chamber is on. The blocker is wide open and it is not even using the carbon filter to cycle the heat.
Mode 1 is ideal for laser cutting that connected with an external smoke purifier or filtering system outside.
Mode 2 is ideal for printing ASA, ABS or any harmful fume materials in high temperature chamber. But in my test, the blocker is downed wide open by pass the carbon filter.
Update on Mode 2: it looks like the blocker downed only during the pre-heating stage but I wish it closes off the entire time to help filter the smells from ASA, ABS during the initial purge.
Mode 3 is ideal for printing PLA, PETG etc. I have never seen this mode at all.
They mentioned in the tiny print on the H2S page that mode 3 is coming later with a firmware update. It will be an optional mode so you will have to select it manually.
Is this possibly why the vent opens fully, but then closes slightly? That would keep the air flow toward the top of the chamber. Vs opening completely and staying open, which would allow the air to travel more downward before going to the rear.
Im pretty sure that when I first got the h2d, it was always fully opened when cooling, but now it closes partially.
Nevermind, something completely different. I took a 2nd look at the pic
I think you can add some Printer G-CODE to do it
Start G-Code:
M145.2 S0 F0 ;to close
End G-code:
M145.2 F1 ;to open
also you need add filament start gcode for cooling like this:
; filament start gcode
M145 P0 ; set airduct mode to cooling mode
M106 P3 S187 ; set chamber autocooling
Check the flap after the initial chamber heating.(until chamber temp is reached its open for me as well) From my experience it closes(opens the filter) as soon as the actual print progress starts
Older post but maybe you can help me a bit!
H2S. My goal is to be able to print ABS with the top/front vent flap closed but the rear exhaust fan on at 20% or so to evacuate fumes to be filtered externally.
I do not need a heated chamber as it gets to 60c as is with the heat bed.
I want to treat the printer like it was an X1C and just be able to run the rear exhaust fan slowly!
I have been communicating with support and they gave me the same basic gcodes you have provided but it isn’t actually doing anything. Maybe I am just missing a step.
Top vent is closed but the fan never comes on.
Thank for any thoughts.
As of now the gcode is M145.2 P0 F0 (P instead of S) to enable filtering in cooling mode.
I personally also found the automatic fan speed increase to be unnecessary, so I set it back to 30% right afterwards with M106 P3 S77.
