DIY soldering fumes extractor
When soldering on electronic boards, fumes are produced and they are not quite healthy. Since I’m starting to do some electronic projects and that I have a 3D printer, I thought about making myself a fumes extractor (also I remembered watching Heliox making one), that could be a good exercise to start learning 3D modeling software.
So I need to design a box that will contain:
an active charcoal filter: there are plenty of carbon filter sheets available but most of the time they don’t provide how much carbon they contain (usually not much). So I decided to make my own, raw active charcoal being quite cheap (~15 €/kg).
a fan: my 3D printer printing surface being quite small, from the most common fan sizes, I can go up to a 92 mm fan. I also want a fan that is quiet, working on 5 V and with a good enough static pressure to push/pull the air through the active charcoal filter. I quite like the fans from Noctua (except for their color) so I took the NF-A9 5V:
- 92 × 92 × 25 mm
- 22.8 dB
- 78.9 m³/h
- 2.28 mmH₂O
- 5V (USB adapter included)
a battery with its electronic board. I happen to have an old power bank that’s composed of a 18650 battery cell and a USB charging circuit:
Active charcoal filter
The idea is to hold small charcoal pellets between 2 layers of some kind of thin cloth with low air resistance but able prevent coal dust from falling out of the fumes extractor. I designed a frame to hold all that.
- take the battery apart
- unsolder the USB A port (only need the micro USB port for charging)
- solder the fan’s 5 V adapter
- got a 18650 battery holder, so solder that too
I used FreeCAD to design the case:
- one emplacement for the fan and charcoal filter
- one emplacement with notches to slide the charging circuit in (I did a small plate to insert behind it to keep it in place), there are 3 holes in the box:
- one for the micro USB charging port
- one for the on/off button
- one for the 2 LEDs showing the circuit status (powered on and/or charging), one small piece has to be printed with transparent filament to be used as a light pipe and inserted in that hole
- one emplacement for the cables and the battery and battery holder
After printing it I realized that some improvements were required, I did some but not all of them. Anyway, here is the FreeCAD fumes extractor 3D model.
I did different tests and as I suspected, it’s far more efficient to have the fan push the air through the charcoal filter than having it pull the air from it.
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