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The K40 is obviously a low-end, no frills machine.  What kind of upgrades do most people make? And which upgrades should be the highest priority?
 

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In no particular order:

- laser head with air assist
- better controller (DSP board, smoothie board, etc.)
- adjustable z-height table
- emergency power shut off switch
- ammeter
- rotary attachment
- honeycomb bed
- water flow pressure sensor
- tube extension

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