Thingiverse
Laser Fume Scrubber - Fume Coffin Redux by micvee
by Thingiverse
Last crawled date: 4 years ago
VERY IMPORTANT: This is used for reducing or eliminating fumes and some particles from the exhaust of a laser cutter. It is NOT meant to make the air safe to breathe inside a room. You must vent out a window. This is super important. This device does not make the air safe to breathe. period. You should understand that venting inside a room with this device will probably kill you or make you very sick. Is that clear enough?
ALSO VERY IMPORTANT: The blower fan goes after (on the outlet side of) the fume scrubber and pulls air through it. The Venturi effect means that any holes or leaks in the box will just cause clean room air to be pulled into the box. If you were to put the blower fan on the inlet side and push air through the box, any leaks would cause fumes to be pushed out of the box, into the room and then your lungs - this is very bad!!
Sorry, not too much explanation here. This is a choose your own adventure sort of project. I used 1/4 inch plywood and square cut 1x2 (nominal) pine for the frame inside. Check out the Fume Coffin project on Instructables, this is an evolution of that design. Note that the Fusion file has 1/2 inch plywood. If you use 1/4 inch plywood, you will need to adjust the dimensions. The cut lists shows essentially what my dimensions were, but I only used them as a guideline.
Sorry for being vague. You should be able to figure out how to make this if you read the fume coffin Instructable. I just re-oriented the filters so that the HEPA filters from outside to inside, this also allowed me to put the carbon filter inside of the HEPA filter.
You need to 3D print two of the 4 inch bulkhead fittings and one carbon canister adapter, or figure out your own way of getting the vent hoses into and out of the fume scrubber. I used 4 inch dust extractor hoses, made for woodworking.
The inside seams are all sealed with silcone based caulk. The end caps are removable so you can change pre-filters (frequently) and filters (less frequently - as needed). End caps and main HEPA filter are sealed with rubber foam weather seal from the hardware store.
This will remain a work in progress, but I do not intend to add further details or edit the files to be more clear. I hope this helps someone, but I didn't ever intend to share this, so I didn't document well.
ALSO VERY IMPORTANT: The blower fan goes after (on the outlet side of) the fume scrubber and pulls air through it. The Venturi effect means that any holes or leaks in the box will just cause clean room air to be pulled into the box. If you were to put the blower fan on the inlet side and push air through the box, any leaks would cause fumes to be pushed out of the box, into the room and then your lungs - this is very bad!!
Sorry, not too much explanation here. This is a choose your own adventure sort of project. I used 1/4 inch plywood and square cut 1x2 (nominal) pine for the frame inside. Check out the Fume Coffin project on Instructables, this is an evolution of that design. Note that the Fusion file has 1/2 inch plywood. If you use 1/4 inch plywood, you will need to adjust the dimensions. The cut lists shows essentially what my dimensions were, but I only used them as a guideline.
Sorry for being vague. You should be able to figure out how to make this if you read the fume coffin Instructable. I just re-oriented the filters so that the HEPA filters from outside to inside, this also allowed me to put the carbon filter inside of the HEPA filter.
You need to 3D print two of the 4 inch bulkhead fittings and one carbon canister adapter, or figure out your own way of getting the vent hoses into and out of the fume scrubber. I used 4 inch dust extractor hoses, made for woodworking.
The inside seams are all sealed with silcone based caulk. The end caps are removable so you can change pre-filters (frequently) and filters (less frequently - as needed). End caps and main HEPA filter are sealed with rubber foam weather seal from the hardware store.
This will remain a work in progress, but I do not intend to add further details or edit the files to be more clear. I hope this helps someone, but I didn't ever intend to share this, so I didn't document well.
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