Sieb druck d193|17
it is possible to print a filter, this one is about ∅150µm - fine enough to filter tomato soup.
This is also a single walled spiralized print, but 50% of the wall is on a different perimeter - which is why the holes are the result of layer height not a break within the filamentflow.
Nice 
I like the idea of printing customized filter.
Wondering what comes next.
Semipermeable membranes ? 
This could be a good option for pre-filters for HEPA air filters too.
If someone is interested in building filters.
Take a look after the book
Handbook of non wooven filter media
I have a cheap second hand copy from Amazon and also “found” it as a ebook on piratbay 
