Not wanting chips to accumulate I sat there with air the whole time. I haven’t tried it without to know the difference. Main concern was chips blowing into my bare control board! Need an enclosure one of these years.
I had an alunimum chip fly into my rambo once, shorted across a couple pins. One of the unused endstops I think. Whole thing shut down and wouldn’t come back on until I figured out what happened and blew it out.
Thank goodness for all the circuit protection in that thing. Once I cleaned it up, everything was fine.