I got the grind correct after about 1 Oz. of grain ground. Being cheap and never wanting to waste anything... I stuck the paint strainer bag with the grain (I went coarser to finer so I wasted very little) in 160 °F (I am American, sorry) and made 10 oz. of wort by reheating the coffee cup every 20 minutes for 30 seconds and then at about 75 minutes I mashout-ed the cup by nuking it for a minute. I then sparged the bag in another cup at 120°F for about 10 min. 0.85 oz of grain in 10 fl oz water measured with the corrected refractometer 1.020 SG. According to Brewers Friend app max was 1.025 for American 2 row pale (what I had) in that situation. So I did 79% efficient extraction... In a coffee cup... In a couple of weeks I think this method will work quite well on a few gallons...

I am looking forward to it. This is fun. I didn't get many likes on the brewing pages on Facebook with this experiment. $US32 for the mill setup, $4 for the bag... 79% efficient... Less than half the cost of extract...
