Come on Monday! No need for a glass screen unless you do nugs or big huge grind. Normal grind will fall through no matter what if you do not use a screen. So.....don't use a glass screen in bowl design and allow much more air flow with less cleaning. I have found this to be the problem with the different glass screen designs. I always have to put a screen in them if I do a normal medium or finer grind. Though you get 100% glass taste......I have not yet been convinced that a glass screen of any sort will be better than just an open bottom bowl with a SS screen in it.