Cut acrylic for the first time and the stench was awful. I have the machine piped directly out a window, checked for leaks in the hose/connections and even ran the exhaust fan for an extra few minutes after the cut. Still filled the room and lingered for hours. I’m very nervous of running anything that can give of noxious fumes at this point.
Wondering if the poop chute should be sealed off, maybe that’s the cause? Maybe I should add an inline fan to increase the CFM? Anyone have any ideas?
Add an inline fan to create a vacuum in the chamber. This way nothing can escape from any gaps or the chute and it will all be exhausted outside.
I don’t know how it’s set up in the H2D. But my laser cutter has its exhaust fan inside the laser enclosure (which is how I’m guessing the H2D is set up). So it pushes the smoke through the vent hose to the window exhaust. The vent host is running at slightly higher than atmospheric pressure. Any leaks, even the tiniest, will let gasses escape. My fix, I removed the fan from the laser cutter so it wouldn’t act as an obstruction (not really certain I needed to do this, but the fan was dirty and needed to come out for cleaning anyway so I just left it out) and I put a separate exhaust fan at the window (see Amazon, there are many choices. Popular with greenhouse builders), so the output side of that fan was inches from the window exhaust. This setup pulls the gasses out of the laser cutter. The vent runs at slightly below ambient air pressure instead of slightly above. It doesn’t leak gasses in to my basement anymore.
And yeah, Acrylic is stinky. There are two types, cast and extruded. I think the cast type is the stinkiest.
I have done a bit with lasers from small to high power…
The one thing that is required is a proper FORCED chamber ventilation.
But that only works as advertised if you add an external fan that provides more suction than what the internal fan provides - it has to suck air into the housing!
The big problem is not the extras one needs to make this laser gimmick work…
Bambu did a great job designing the H2D in order to get as much as possible inside but they did not consider in any way that people need to be able to keep the chamber clean and free of those fumes and particles created by the laser.
Take my old CO2 laser…
All possible holes and slots in the inner walls were sealed off, then I drilled a bunch of holes into the front to allow air being sucked in and going over and under the workpiece - then they get sucked out by a big inline fan.
Despite that I had to clean the inside on a regular base.
Not that much of a problem if the optics are easy to reach and the rest NOT covered by vital things one would have to remove.
If you ask me Bambu shot themselves into the knee with the laser addon as it just is no good inside a 3D printer…
There is a reason those who added a laser to their homebrew printer used an open frame design…
I don’t own the H2D, so I can’t say anything about the structure.
But please pay attention to this method: Do not use a inline fan to take in too much air so that the H2D fan does not start moving on its own as soon as it stops. In certain situations, fan rotation can be used to generate power on the connection board 
My inline fan on my laser runs at 50% so that it doesn’t ‘suck in’ and start the laser fan moving.
The laser fan pushes the smoke out into the exhaust pipe and the inline fan transports it further.
There is no need to create a vacuum in the chamber of the H2D.
Laser fume extraction systems are essential for removing harmful particles and gases generated during laser cutting or engraving. They protect both operator health and equipment longevity. Look for units with HEPA and activated carbon filters for optimal air purification.
I just bought this extra fan
https://www.amazon.nl/dp/B0DM1S43JZ?ref_=pe_111809601_1111269701_t_fed_asin_title
Will see if that works.
I think this is necessary, along with closing off the poop chute which I’m not sure why there’s not a cover for given the air flow direction. Even a 12v computer fan would be better than nothing. There’s no way to create a vaccuum anyways since the top vent automatically opens when cutting to create an intake. Just need to crank up the CFM’s a bit, not too much. I’m going to experiment with some wood cutting to get the right setup before I try anything non-organic again.
I really hope others are ensuring that their machines are exhausting properly. This could lead to big health problems with continued use.
I’m going to pick that one up as well, looks like it’ll work well and a good price. Thanks for the recommendation!