I use a Hailea AC-208 piston air pump, which at 35 litres/min is a little less than ideal, but it works. You can get the 80 litre one for £35. The usual garage type compressor won't run all the time without overheating as they are not intended for continuous duty. The pond pump is also quieter, and as my den is in the house, it means I can CNC into the night without waking SWMBO. Using a worshop vac at the same time keeps the debris under control.

Rob