Picking a Portafilter for Your Machine

If we were to put together a list of the questions our customers most frequently ask, there’s a good chance portafilter-related ones would top the list. What size should I buy? Will this fit my machine? While so many of these answers harken back to personal taste and desire, there are some tricks and tips we can expunge to make the whole shopping process a bit simpler, or at least smarter.