![]() ![]() 4'x4' piece (half a sheet) of 3/4" thick birch plywood smooth on both sides.An old extension cord (we only need the male end).Qty (1) 3/8" dowel pin (for the router jig).Qty (1) 3/8" Romex clamp or cord strain relief.Qty (1) Roll of squishy neoprene shelving liner (It's about 1/8" thick, soft, makes great gaskets).Qty (1) Harbor Freight Router Speed Controlled.Just ask for "4 by 8 coconut shell carbon, for vapor filtration") Qty (1) 55lb bag of activated carbon (I called them and spoke to Karrie Gibbons.Qty (1) Duck Brand 1285234 24-Inch by 15-Inch by 1/4-Inch Foam Air Conditioner Filter.Qty (2) 3M Filtrete Air Conditioner Filter, 15-Inch by 24-Inc.Qty (1) 29500 Honeywell Air Cleaner Replacement Filter.Qty (1) Fantech Inline Exhaust Fan, 392 CFM, Centrifugal for 6" Duct.Depending on the supplies you have laying around your workshop, you should be able to build one of these for somewhere between $400 and $450. I figured I would document the process so other people with laser cutters could try their hand at doing the same. After taking a close look at how my old unit worked, it was pretty clear that I could build a similar unit quite easily that would allow me to use off-the-shelf and readily available parts. Going through this challenging and frustrating process with them got me thinking. ![]() This new company claimed to supply the same replacement filters, but after almost three months of going back and forth with them, it turns out that their filters are no longer the same, cost way more and look to be much less robust. Fast forward to 2013, I called up ElectroCorp to buy replacement filters for my unit and found out that the original company was sold and is now being run by another company. It was a bit expensive, I think I paid $1500, but it did a great job extracting even the worst fumes from cutting acrylic. After trying several fume extraction options, back in 2002 I found the ElectroCorp RSU filter. Well, at least the fumes from cutting smell awful and are quite harmful to breath. I built my first laser cutter in 1996 and learned right away that laser cutters "stink". ![]()
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