I got another of the machines all booted up and warmed it (#2) and my original machine (#1) up together and did a little temperature experiment.
My hunch was that machine #1 was too hot. Long story short, it's pretty much exactly the temps that the other one is pouring at. This leads me to conclude that I was pretty much dead wrong! What are the odds of two machines being exactly as too-hot? Long odds.
I poured four shots from each machine, alternating the machine used to pour each shot. They were both accurate to within 1.5 degrees according to my food thermometer. No point in publishing any data as by now we know very well how much temperature is lost between the group head and the bottom of your vessel.
Doing some longer shots I noticed a (roughly) 10 degree drop over a 150ml pour.
Originally posted by noidle22
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I read somewhere else on here that the voltage at the switch was measured at 9V. My pair of 12V relays seem to be working fine alongside another machine.
Long Story Short: I F'd up!
After some experiments with my grinding method this morning, I realised what my big mistake may have been: I trusted the ground retention of my Mazzer too much, in fact the amount of grams which it retains can vary wildly from near zero to about 4 grams! Switching to a weigh-in post grind rather than pre at the cost of however many more beans I have to leave in the hopper overnight only to be drank by my early rising flatmate!
Thanks for your gracious assistance once more, CS users. But I think I got this one licked: CASE CLOSED

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