Solder Fume Extractor - 120mm fan
Description
I've seen a few fume extractors for soldering here, but the couple I tried didn't suck... well they didn't suck the fumes, unless they were only a few millimetres away. Unless you have a large mains power fan, you are not likely to get much air drawn. However I had a 120mm fan spare and looked at making it as efficient as possible within reason. I used some of the advice from a large ventilation fan company on inlet and outlet angles: https://www.fantech.com.au/Content.aspx?ContentID=L5#2 I haven't followed their guidelines exactly because that would mean an outlet cone that was about 120mm long, but I did try to keep the angle under 7.5-degrees (6.5) The inlet was also a compromise. I did read elsewhere that vanes to direct the airflow also helps (check YouTube) so I put those in the inlet. I have no idea whether they do, but you can take them out via the Fusion file if you want. The outlet cone I think does make a difference, even though it is too short. I used a foam sheet of activated carbon for a filter - it is about 5mm thick so it fits in the grille nicely (grates toward the fan blades.) I've made this quite thin (about 1.6mm) to save on filament. It doesn't need to be very strong, although the frame around the filter grille needs to be reasonably robust. It will still take multiple hours to print and will give you a good indication on whether you have any axis shift in your printer. It's held together on the inlet side by M5 bolts and normal PC fan screws on the outlet. The photos show my original outlet design with a flat base - it didn't need it to be stable so I have taken it off in the final stl files.
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