DIY Laser Fume Extractor: Pre-Version 8.2 Units

DIY Laser Fume Extractor: Pre-Version 8.2 Units

Previous Laser Fume Extractor Versions:

Before we reached the current working version of Bernie, 8.2, the DIY Laser Fume Extractor, there were many mistakes and many revisions to the designs and prototypes. Here are some for your entertainment:

First design for laser fume extractor with an inline fan
First design for laser fume extractor. PVC pipes and flexible corrugated dryer vent ducts with an wye connected to an inline duct fan. This was then connected to activated charcoal canister (drawing above has the last two switched around)
Apologies for a crappy stitched photo here: From the Laser Engraver (top) ⇨ Drier Duct ⇨ HEPA Filter ⇨ Activated Charcoal Filter ⇨ Inline Fan ⇨ Out the wall via Drier Vent with a Wye
The 2nd version incorporated multiple 12 x 12 x 1″ HVAC pre-filters (3 shown above) before the activated charcoal unit. The enclosed activated charcoal canister unit allowed for the fan to pull the exhaust, as opposed to pushing, which allowed for a safer design by removing one possible method of the fume leakage.

 

Earlier concept of modular design.
Here, you can see a 90° turn with three internal veins after the bottom output exhaust port. The two exhaust from the engraver then enters a pair of 12 x 12 x 1″ HVAC filters (MERV 13) one after the other. It then enters 12 x 12 x 12″ HEPA filter. Finally, it passes through a 12 x 12 x 1″ Charcoal HVAC filter.

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First introduction of activate charcoal pellets and laser cut 90° vein incorporated exhaust turn.
Migrating to pellets of activated charcoal instead of the canisters forced us to change the flow of the exhaust vertically so the exhaust would just flow through the gap on the top of the pellet pile
This is pretty much how Bernie 8.2 is. 1 & 2 are the exhaust vent from the engraver. 3 is the blast gate to adjust the ratio of the exhaust flow between 1 &2. 4 =Mixer, 5=Large Particulate Filter, 6=Elextro-Static Filter and 7=Activated Charcoal Filter

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