Gunk on Print

What's your environment like ?? Looks as if you have a kinda dirty place. Lam will always accentuate any imperfections such as dust, light weight hair, bugs and even unlevel inks deposits. You might need to bud a clean room for your printers.

 

It could easily be the printer, but it doesn't look it to me. Not based on that one picture. Having an HVAC system in the building doesn't mean you have a clean environment. Cleaning and mopping often..... seems you must have a dirty place and are trying to keep up with the air and dirt problems, which in it's own will also spread particles ALL over the place. What was on the floor, you just converted to airborne. Like you said, they are so fine, you don't see them til the lam goes down. That's how miniscule they are.

How close are your cutting machines ?? Not cutting vinyl, but saws for cutting aluminum, wood, pvc's and other substrates ?? Do you have a CNC ?? Any sandblasting going on ?? How close is the garage door ?? Does it open and close often throughout the day ??

 

Well, ya got me, but it still looks like contamination of some sort. The HVAC setup is in that room ??

What is a squeeze table ??​

 

That type of vinyl has a top layer that has less absorption than regular vinyl.
It looks like you're putting more ink down than can cure correctly, when that happens the ink
pools up around imperfections in the vinyl and/or micro trash that normally wouldn't be an issue.
I would either slow down your print, increase the heater or scale back the black's values & see if that
helps.