Fume Scrubber

by unitconversion, published

Fume Scrubber by unitconversion Aug 9, 2012
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This is a simple fume scrubber to help get rid of ABS fumes. It's intended to go inside of a heated build environment and keep the interior fume levels down without wasting heat by blowing them out.


The fan_mount_v2.scad file from http://www.thingiverse.com/thing:18273 is used. Either version of the scrubber just uses bulk activated charcoal (such as this: http://www.amazon.com/Acurel-LLC-Economy-Activated-Pellets/dp/B000YIWT0M/ref=sr_1_2?ie=UTF8&qid=1344565074&sr=8-2&keywords=activated+charcoal ) and can be attached with self-adhesive velcro. The STL files are for 40mm fans.

Version 3 (Round):
This one requires no filter material, you just pour some charcoal in the top. It works much better than v2, but is harder to print; slic3r wants to print the filter grid as a series of squares rather than as a grid. To counteract this, I offset the x and y lines in the z direction so that you get the first layer as a support and it seems to work for me. If you have a nozzle fan (I don't yet) I think this would work wonderfully.

I will probably be experimenting with different screen designs to see what prints the best. I'm fairly sure the best thing will be to have non-intersecting criss-crossing bars. That way slic3r should have it draw the x lines on one layer and the y lines on the next, then repeating.

Version 2 (Rectangular):
To use this you put a small piece of filter material between the grate and the fan and then fill the top with bulk activated charcoal and then put a small piece of filter in the top to plug the hole and mount. If your fan doesn't have a built-in guard (an X across it is enough, just not open) you'll probably want an external one between it and the filter to keep the filter out of it.

Version 1 (N/A):
This was abandoned and never uploaded. It would have been similar to V3.

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So this thing will filter and trap the toxic fumes within the case and not venting them out?

Some yes. Mostly it only traps the smell. it all tempest on what you are using as a filter medium. Also need to change or reactivate the charcoal to make sure its doing its job.

Any chance you could upload a STEP file of your design. I use CREO and cannot work with the STL - it's just a dummy file, but I could with the STEP. I'd like to play with the design a little by extending the fan mount bosses down to the angled surface to eliminate the overhang and I also have an Idea for a bracket to allow this to snap onto it. I will share when complete. Thanks.

If you download openscad and the .scad file you can export it in a few formats, but step isn't one of them I'm afraid.

OMG, this thing.....

I printed it, mounted up a print cooling fan (24v), has been working great. I can't smell any abs, helps a lot I say.

However, today I arrive home, look in the enclosure, and the velcro gave way, which spilled the contents on it in the enclosure and some on the print bed. I haven't printed in a few days, and it just had to wait till it was running. The print still looks fine, but I won't really know till its done.

so, lesson learned, you need a mounting bracket. Any ideas?

Comments deleted.

if you google the MSDS of ABS it will point you towards using a organic filter to protect your self.

I googled a bit and found out the following:

Activated charcoal is good at trapping other carbon-based impurities ("organic" chemicals), as well as things like chlorine. Many other chemicals are not attracted to carbon at all -- sodium, nitrates, etc. -- so they pass right through. This means that an activated charcoal filter will remove certain impurities while ignoring others


ABS fumes ar non organic as far as I know, so maybee the chemicals just pass through the filter making it useless?

Maybe it does removes the bad smell, but that does of cours not mean that all the chimicals are filtert.....

Does anyone knows how effective this active charcoal is to filter the ABS fumes? Chanes are that some chemicals get through the filter? Maybe there are different types of charcoal (i saw you are using charcoal for a waterfilter, dont know if this is as effective when using in airfilters?)

I think I wil build an enclosure with a fan that sucks the fumes out through a hose, and hang the hose out of a window. Less practical and you suck away warm air, but you are quite sure you get rid of all the fumes.

Of course, this thing would work anywhere fumes are a problem. Say as an overhead solder fume extractor. 

Is that velcro you're using to attach the air filter to the inside of your 3d printer's enclosure? If so, what are you using to stick the velcro to your air filter and to the inside of your 3d printer's enclosure? What type of glue are you using?

You've used it to print lots of stuff and the velcro holds?

Thanks 8-)

I'm using the self-adhesive velcro (like this: http://www.amazon.com/Velcro-Products-Industrial-Sticky-Back-positioning/dp/B004E2IADO/ref=sr_1_3?ie=UTF8http://www.amazon.com/Velcro-P...
amp;keywords=velcro+industrial+sticky+back ). It works really well and as little as the parts weigh, I haven't had any problems with them falling.

Do you use the fan at full blast or use a microcontroller and / or a stepper motor?

I just run it full blast with the 40mm fan wired straight to 12v power. The design is fairly restrictive so you don't get a whole lot of flow out of it, but it still works pretty well. I'm in the process of coming up with a new design with a higher filter surface area.

This is such a good idea...

How much filament before you need to replace the carbon?

Not sure yet, but I have to imagine the little carton I got at walmart is going to be a lifetime supply.