You would be worrying needlessly. I have used the snap and fill method about
40 times and have never experience a plug. I suspect the reason is that the
nozzle is the smallest size passage in the flow path. Think of it as filling
through a funnel, only in reverse. Certainly any particle that passes
through the small end of the funnel is not going to plug the progressively
larger openings. Besides, if your syringes, ink, or snap and fill adapter
have particulate contamination you have much bigger problems regardless of
what fill method you use. Having used ball bearings and set screws for some
time before switching to the snap and fill method, I can assure you it beats
the old method hands down. The only suggestion I have when using the snap
and fill method is not to pull to much vacuum with the syringe when you are
initially removing the residual ink. The foil bags become delicate after
several refills. If the bag happens to develop a leak while you evacuating
you will suddenly feel less resistance. If this happens you should just toss
the cartridge. I suppose you could use the snap and fill adapter to remove
air when filling though the cartridge hole, but never found the need since
using a clamp to squeeze the sides always seemed to do the trick. However,
I have found the a snap and fill adapter for the color cartridge works great
for removing any foaming and air from the sponges after filling.
http://www.inksupply.com/index.cfm?source=html/snapfill.html
http://www.inksupply.com/index.cfm?source=html/snapfill45.html
http://www.inksupply.com/index.cfm?source=html/hp_primer.html