Air assist on K40

Can anyone tell me what sort of flow rate I need from a pump for air assist on a K40?
(looking at a cheap pump rated at 3.2 l/min is this too low??)

Mine is 70L/min, and it barely gets the job done for acrylic. Bumping to a full sized compressor of cutting MDF.

I only have a small 24V pc fan and it works fine enough for me, also for HDF, so your compressor can only be better.

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