We have a Gt-782 and the Viper pretreater. You just need to know.
1. cost of pretreat per shirt which will vary per pretreat method.
2. average ink cost for size of design you are printing.
3. cost of labor to pretreat and print the shirt.
4. cost of garment.
5. cost of over head expenses.
All of the above will vary from shop to shop. Best thing to do is to keep track of pretreat and ink usage and calculate in the rest of your numbers.
That is how we have had to do it and we have been at it for 5 months now. Hope this helps.
