I have a P1S and a H2D printer that i want to independently attach an air purifier for indoor use (2 Purifier’s). I have searched for ideas and found that either you bag your printer and exhaust the bag and or set the speed of your purifier to create a slight negative in order to properly exhaust the system. I have ruled out the bag option and seen more negative issues in speed settings pertaing to temp control in the chamber through out any kind of print. My printers are for fun so i continually change filaments depending on what I’m printing so one speed setting doesnt work. My question is has anyone one ever setup a mixed air system where the fitting at the printer allows for a controlled amount of air to enter from the room causing a Venturi Effect that will allow the printer to perform as designed and still exhaust the bad stuff with out over cooling in any given print job in regards to filament selection and temp requirements.
Thanks for any help you might have.
Jud
I keep looking at these various exhaust systems people are making and nothing has been making sense. So basically, I have been trying to separate the issues of what I am trying to acomplish
1st, exhaust out of the machine, Bambu seems to have a solution for that, but it’s not a constant removal. Additionally, the times you probably want it, like printing ASA or ABS, you’re not supposed to use it to keep the heat in yet the machine is not air tight so during a 10 hour print you have some leaks, but at the end of the print, it runs to clear what’s left in the chamber.
The second issue is exhaust to the interior of your house with in-line HEPA and charcoal filters, that a 30-60 percent positive push to get that air through the filter. The fan has to be running.
3rd is exhaust to the outside air. This bypasses the need for a filter completely if you choose. With an external fan pulling the air continually out of the machine. Yes, you’re losing both chamber heat and house heat/air. But you can tune it to be negligible. To draw air out of a 4 CF chamber, you basically need 4-8 CFM. A 1-inch hose will pull 10-15 CFM so instead of a 4 ich duct design, actual size should be pretty small. I was thinking of using a CPAP hose, one box at the window with a fan.
Some people have said they leave the built-in fan run at 1 percent and that level of exhaust is enough. There are a few good videos on YouTube talking about negative pressure and a tissue test.
Still working out my thoughts on this. One of the models on makers world from a chines guy captures the use of small hose and a rheostat going into a sewer pipe. I wanted to see his assembly pdf but its written in chinese.