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3D Printing and Solder Fume Extractor (120mm case fan)

by ggoss Oct 31, 2013
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Hey! I just built this and love it... however, could you recommend an approximate CFM rating for the fan? Lots of 120mm fans now are 40CFM (rated as "quiet"), which is far too slow, but there are lots of 80, 95, 100-ish, 120, and 150ish CFM fans. What is your fan rated?

Also, I recommend people to rotate the panel by 200 degrees on the Y axis before slicing, so that the "walls" (of the empty box) print
straight up, and there is no need for support. Also, the STL should be sent out to netfabb for repair, or users should re-render the scad file on their desktop with the latest OpenSCAD.

Final thing... opening the "panel" up in OpenScad revealed a part that is hovering far away from the origin point... why is that? Just curious. It was a little awkward to rotate and view, but I eventually zoomed out far enough to see it.

Again, I appreciate it! I saved at least $20 making this!

Yeah, I rotated everything in RepetierHost before printing; it sounds like you printed it exactly the way that I did! :) It probably would have been helpful for me to rotate the actual files for ease of printing- I'll add this to my to do list.

I did use Netfabb for one of the legs, though I thought I corrected the other files so that it wasn't needed. I'm also not sure why I made it so far from the origin (I think I was just in a hurry to hit 'print' before going to bed). I'll look over these issues as well.

As for the fan, I used a 74CFM fan (I had a $10 gift card to a local store for doing a survey, and didn't want to spend anything more). This only works well with 2 filters (I believe I made the design to support 4), though it only generates enough air flow for clearing solder fumes (as opposed to ABS fumes from further away and from a wider area). I definitely recommend getting a stronger fan if you can. If you do use fewer than 4 filters, you can take the strips you cut from the edges of the filters to make them fit into the frame and place them between the filters (around the edges) as spacers, or you can cut the filter-holder so that it is thinner. I left space between the filters hoping that it would create some turbulence inside of the air pocket between them (and thus more contact with the filters?), though I'm not sure if this really has a sizeable effect on scent dissipation.

I'm glad you liked it! Good luck, and be sure to let me know how it goes or if you need anything else!


Awesome! I was searching yesterday for something exactly like this and then poof there it is in the new stuff. Thank you!