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ANTALIFE

3D Printed Solder Fume Extractor (HEPA Filter)

by ANTALIFE Aug 3, 2018
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I have a question:

How did you print the "main frame" (direction of print / placement). Did you use support - unfortunately I fail to print it properly.

Thanks.

If you mean the "FanFilter-mount_v10a.STL", this is printed as is. I also printed with a large skirt around the base (20mm) to stop the corners lifting

Yes, "FanFilter-mount_v10a.STL". How did the overhangs print? They are sagging using PETG - the printer tries to print in full air (especially with the flat area above the PCB compartment and "the bars at the top of the filter mount" (where the HEPA filter should fit)). I assume you printed it as it is shown (in the upright position) or did you turn it?
Thanks for you help!

Yup printed in upright position, oh yea also had support material enabled to help ;^)

Ok, got it finally printed with supports. Had some minor warping at the corners but overall ok. The HEPA filter fits.

BUT the fan wont fit. I am using a standard high CFM fan (Artic). But it seems it has another width than yours.

Any suggestions on that -> I think it is essential, that the fan is close to the HEPA filter (or is distance to the HEPA filter not essential)?

Wait... Now I see ... Will order a standard 38mm fan. :)

Hi Antalife,

Another minor question. I finally received my 3A fan. How to you limit the current to the fan. Do you use a constant current source (which) or do you use a high power resistor (that is a big resistor with 12v*3A).

Thanks.

Chris.

Hey Chris

No need to worry about limiting the current to the fan. If the model you got is similar to my one (and many other fans out there) you control the speed of the fan by varying the duty of the PWM signal. This you can do with a simple 555 timer circuit like:

http://www.pcbheaven.com/circuitpages/High_Frequency_PWM_Fan_Controller/
OR
https://www.overclockers.com/pwm-fan-controller/
OR what ever else you can come up with