June was a million prints. A little over 33,000 per day; 2 prints per day indicates 16.5k machines.
However, back to @chris1’s example above. He’s not trying to guess what the costs are to Glowforge. He has no idea - and he said that. It was simply illustrative of how processing adds up - and seemingly adds up at a rate greater than the faster processing makes up for (not a 1:1 scale from slow processing to fast processing, thus quashing the faster processing ultimately costs less because it’s less processing time).