Jim
you are not going to get good shot until your shop area hit 60F or above.
I won't bother turning the machine on at my place until it was 65-75F if I want to get the right sized shot.
If i want #4 or bigger then that I'd do when it was 50F below.
But that's just my .02 worth- the Instructions say "ROOM TEMP" .
some folks can handle cooler temps than others but room temp. for the Shot maker means 65-75F . It can be done when it's 90-120F in the shop too but you will sweat you buns off working the machine in that heat. And even if you have got room temps make sure you don;t have too much breeze or air flow moving past the dripper heads. that will freeze them up all day long.