This is a 2nd Stage air filtration system based on thrutheframe's excellent Bento box recirculating air filter. the goal of course being to remove as many VOC's as possible. This is a add on to the full bento box to add extra filtration.

FEATURES

• Second stage air filtration that creates a sort of negative pressure system to filter air that comes out the chamber fan opening.
  • I torture tested this by running it without the bento box on. on a 2 hour print with ABS the smell in the room became perceptible after about an hour, indicating that it was doing a pretty good job on its own. When used with the bento box even my wifes Burton Guster level supersniffer was not bothered.
• Air bypass ensures it is not pulling excessive air out of the chamber causing loss of heat retention
• Can be turned off when not needed.
• When off it works as an excellent exhuast muffler.
• AMS compatible

WHAT YOU WILL NEED

• I intentionally didn't include the hepa and carbon portions of the original bento box. Support thrutheframe and print plates 2,3,4 from his print profile. you can remove the model for the fans as I had to modify it to run the wires.
• M3 x4mm (4.2mm OD) threaded inserts - I used ones from this kit: https://amzn.to/3RKi3KF alternatively if you arent in a rush. Aliexpress is a super cheap source of getting lots of threaded inserts. you can never have enough for 3d printing.
• m3x25mm cap head screws x4, and m3x6mm scews x8 - this kit is excellent if you dont already have them: https://amzn.to/3H2TMKM
• SPST round rocker switch https://amzn.to/3tsDHuR
• 5.5x2.1mm DC power jack https://amzn.to/3S1UH4k
• 40x20 fan - https://amzn.to/48C0y6w
  • If you're starting fresh, The ideal solution IMO is to print the DK riser and the original bento box, buy 2 sets of the 24 V fans from the link above, a set of 24 V COB LEDs , a 3 way splitter, and then you can run both bento box fan sets, and the LEDs off the power supply from the LEDs
  • Pay attention to voltage. If you have a bento box, pick one that matches your bento box and use a splitter like one of these: https://amzn.to/41Fp4AW. If you did the 5V modification to run 5V fans in the original bento box you could tap that same power source and run 5V fans.
  • 40x28 fans are an option. I found the 40x20 adequate, but here is a link if you would like more power. https://amzn.to/3RKqFAU
• Power supply - I keep a massive supply of these from old electronics and can always find one to work, but if you need to you could buy one of these. https://amzn.to/3H2jKxX **some links are affiliate links.