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I had the same problem till I set up an exhaust system. It uses a 4in duct and a computer fan with the fan sucking the air out the window. I store it in a shoe-box when not in use.
Add an Arduino-based Optical Tachometer to a CNC Router
If you can manage a vibrator on the draw-knife ( I used a vibrating motor from a dead cellphone) mounted as near the tip as you can. Start out slow and dial it up till you lose accuracy. Mine cuts thin leather no problem.
Did this the other day by accidentally reversing the power from a pair of AA batteries. Piece nailed me in the cheek!
WARNING: If you reverse the polarity to an LED you will cook it for sure.There is even the chance it will physically pop. Also putting any amount of current on to a non-rechargeable battery WILL cause extreme heat and the thing might explode.