I just bought a Babylock Destiny embroidery machine. This is a small family owned shop, and the two brothers work on a wide variety of machines. They told me not to use canned air, as it's not just air, but has propellants and possibly lubricants in it also, and those items can cause problems gunking up tiny openings in the machine. He did say if I wanted to blow it out, I could use my setup I have for airbrush painting, that has a water separator and I can put the pressure way down.
Now I know that with the HQ Infinity, the same dealer said it needs to be cleaned with compressed air, (and canned air is fine) but not to use it on my HQ Fusion because the housing is built so it won't blow stuff out - but in where it can get lodged and cause more problems.