I see one says $2 a shirt 250 shirts =$500 in 3 hours. You have your customer contact, films, screen making and reclaiming, press setup.....ect. Then your downtime, overhead, equipment cost and repair
That's me, and yes, the only reason i do screen printing is because is so cost effective. I only do bulk prints once or twice per week, 6-7 months of the year.
My average ink cost is $0.08 shirt, and that's 99% of the printing cost.
I don't reclaim the mesh. I simply rip it off the screen and put a new one on. They are not reclaimable anyway, as I heat press them instead of using emulsion. This method is much faster (2-3 minutes job).
I re-mesh 9 screens at a time with my homemade mesh stretcher. Just a big steel frame, based on a wall mounted bed I was given for free (saves space when not in use).
Press setup is non existent for a single color print. The off contact is set with foam pads and there is no registration to worry about.
Equipment cost is an once off investment is screen printing, and no much to go wrong in a well build manual press.
I do 250 shirts in 3 hours easy, including drinking coffee while at it. I use fresh ink, known to work well on the mesh I'm using, in an air conditioned workspace... So there are no surprises.
My business model is not "print on demand" though. I simply print and sell in bulk. Some times I make $0 per shirt and some times I make $10. My average is $8 so I don't care.
Yes... that's $2,000 in 3 hours, Twice a week. But not many people can do what I do. It took me 4 years to set it up.