K40 Improvements

	We got a K40 laser cutter for my wife's classroom. These are the improvements we made to it.
	The cutter came with a really weird clamp for securing the material you want to cut. We replaced that with the steel grate looking thing you see here. This bed can also be raised and lowered, but it is a tedious process. Also pictured here is the hose and drag chain we installed for air-assist. Of course, we also had to get the air pump for the air assist. In the picture above, you can see it on top of the 5 gallon soy sauce bucket we use for a coolant reservoir. We replaced the soy sauce with distilled water and 8 drops of Tetra AlgaeControl algaecide.
	You change the height of the bed by turning the nut on the all-thread. The steel plate that the floor flange is resting on was also something we added, because the case came with a four inch circular hole in the bottom (seriously).
	We installed a momentary switch so the laser power cuts off when you lift the lid.
	The momentary switch was added in-line with the wire from the power switch.
	We added covers over the intake vents to prevent escaping laser light. On the other side of the case, below the monitor, you can see the wooden case we made to hold the Raspberry Pi that runs the laser cutter. K40 whisperer is the cutting software we use.
	We added an improved exhaust fan at the point of exit. It would be better to put the exhaust fan on the other side of the barrier, so there is negative air pressure all the way to the outside, but that was not practical.
	There is a fire extinguisher within reach and visible from the work area.
	The grounding connection to the case was too small and did not ensure good contact. We sanded off the paint at the point of the grounding wire attachment. We replaced the flat washers with star washers. We used larger guage, single strand wire for the grounding wire.
	And we grounded it.