RE: mp screen, I'd prefer to have one that I can remove, so I can actually see the screen, the two funnels and the inside of the mp housing -- every once in a while -- and know for certain when they are clean.
I have a SS that developed loose mp screen in first two weeks and was a little frustrating to realize what had happened, but it was just at the same time that we here were learning about the precision tweezers so I went straight to that method. A tool and some proper guidance from HL would have helped.
I have a Ti Hopper that will not allow me to disassemble the mp innards, and a SS mp that will. I do very frequent alcohol baths (usually only 20 to 30 minutes every couple of days, long soaks now and again) for both. The couple of times that I've disassembled SS the mp for deep cleaning has given me much more confidence about results of the cleaning.
@MoltenTiger , funny but my habit recently changed to counterclockwise swirl (a la George Costanza?) when I swab mp with q-tip or trusty toothpick. I hope to swish stuff in the direction that will carry it up and out of the threads rather than drive stuff down into threads.
Air flow is a huge improvement on #2. This might be from having a newer MP or not having any of the oven holes blocked (yet). I had no idea the difference until now. Having another Hopper to compare to is handy!
I noticed this BIG TIME recently upon receiving a unit back from repair service when it blew it's brother out of the water, performance-wise. Big difference in draw and extraction. I realized that with the weaker unit I was rationalizing things like, "I guess this batch of product needs, like, 6 primer hits to start producing." I now see folly in that! and sent the weaker-performing unit back just the other day.
Amazing that after these what, 3 years, we are now drilling down deeper on the cleanliness thing (inside Hopper Body, not just mp), as relates to functionality, serviceability, folklore, catastrophic failure and viability. So interesting that all this is coming to fore as the product leaves the infancy of per-order stage and grows into its' mainstream potential. I see this as a major defining moment and test in Grasshopper's life story.