air filter (activated charcoal)

air filter is basically for filtering toxic gasses from the printer while printing.
activated carbon is used as a medium.

I was inspired from the idea on instructables but i was not able to find all parts so here it is !
http://www.instructables.com/id/Activated-Carbon-Air-Filter/

you can find the charcoal here -
http://amzn.in/hyctZ99 for india
http://a.co/8AD0XHG for usa
the shape may change but works similarly.

the "base ring" is for maintaining the inner cylinder at the place.