https://hydrobuilder.com/phat-filters-c … s_PHATCHAR

Seems a bit pricey at $85 each for a 4 " filter but will last for years with regular maintenance.

These look interesting a metal box with flanges that hold a hepa filter. These are designed as greenhouse intake filters but see no reason they could not be adapted to a 3dp enclosure. they come in various sises from 4 inches to 14 I would think 4-6 in would be plenty for our needs.
https://hydrobuilder.com/ideal-air-hepa … IyNzg3In0=

Interesting, that does look like a good value, box and filter only $28, just add fan?  I've already done all the work of running it to the outside, but if I hadn't then you could probably get a 6" fan off Amazon, combine it with that box, and have something pretty good for indoor particles.  Albeit HEPA does nothing for gases so venting it outside is still probably going to result in cleaner indoor air than trying to filter it unless you get two, and then fill the second box with a bunch of activated carbon.

I decided to apply the 'mesh in print' technique.  I started a print, paused, and laid a mesh screen over the print, and then resumed the print.  After it finished I cut the screen, painted it, and attached it to my metal exhaust.  It works!  It should keep bugs out as well as any screen door mesh does, and the air flow didn't feel diminished.  The wire is actually embedded into the printed object between two layers.  One thing I would change is that in the future I would design in a little curve where I plan for the screen to be laid in, then after printing I would fill that area with wood filler before sanding it flush and painting.  Merely to hide the screen a bit better along the outer edge.

Hi Genesat
I searched and could not find a Supplier List.
Could you please supply a link and the name of the seller.
Thank You!

http://www.soliforum.com/topic/4195/polymer-suppliers/

And the one that is about $3 per lb is on the last page, link.

Hi Carl
I love to use eSun PETG for some things. It is not suitable for my specific production print. Too flexible.
My target market is people who would appreciate the concept of NatureWorks brand PLA plastic. But it is difficult to source the extruder feedstock at wholesale prices. Fialstruder has ABS at a price that will allow me to compete on price with the imported competition.

One of the newer sellers on the supplier list (last page) sells 4043D for a little over $3 a pound for 5lbs.  They also wrote that you can contact them for bulk purchases; that's getting pretty close to the price of ABS.  If you truly would prefer PLA over ABS.  PLA can be trickier to extrude than ABS though if you haven't done it.

I will probably be setting my print farm up for ABS. I live in Northern NY near the Canadian border. We get sub zero F temperatures. If I vent my farm outside then I have to pay $$$ to heat that cold air. That is also along with trying to maintain a high temp in the build area.

I have seen some enclosed printer with carbon canisters to clean the air. Then you need just a small exhaust fan to keep negative pressure.

I really have been trying hard to avoid ABS.

If you want something stronger that PLA as well as not being biodegradable like PLA then try PETG. It won't break down like PLA when exposed to the elements and is IMO stronger than ABS although not as flexible.

I have seen some enclosed printer with carbon canisters to clean the air. Then you need just a small exhaust fan to keep negative pressure.

I really have been trying hard to avoid ABS.

I was going to design and laser out a box to put around the Filastruder, with an opening for a 4" tube to come in, and a 2.5" or so opening for filament to go out (negative pressure to suck air in by making exhaust larger than inlet).  A trial run with tubing zip tied to be parallel with the nozzle, no enclosure, completely eliminated the smell of ABS - so I'm not sure an enclosure is actually needed.  I used this fan: https://www.amazon.com/gp/product/B0085GTELM/ , and some 4" wire/plastic tubing along with some 4" rigid tubing.  If I were buying things again, I would go with 4" semirigid aluminum ducting instead of the 4" wire/plastic for the last bit going to the Filastruder.

Unrelated, but you can also see Ian's Filawinder modification - a digital thickness gauge on the Filawinder with a screen that does a continuous readout of current filament diameter.  It's working great so far.  https://www.thingiverse.com/thing:222603