A peristaltic pump with a stepper gives you positive and predictable fluid delivery, no pressurised containers with pressure settings, needle valves, fluid viscosity and so on to upset the balance of perfect lube volume delivery.

It's all completed and connected up, right this minute it's lubing, with just enough air to clear chips from the cut, a job cutting parts from 2mm D2 Tool Steel plate with a 2mm 4 flute EM, seems to work nicely :D