The Lines Tee was inspired by the Palace's Line Stripe Tee.
Screen Basics
Most printers use the standard 20"x24" screen for at least 90% of their jobs. Screen dimensions usually include the whole frame size; adding the 1.5" walls into account.
The actual screen has a dimension of 17"x21" but the screen needs some flex to bounce onto the garment. The ends are are too taut which won't be included into the print area.
The 20"x24" screen has a print area of about 15"x19" if you give about 2.5" allowance on each size for tautness, tape and squeegee.
For our set up, the maximum print area is 12.5"x18.5"
Trial & Error
The initial design was to screen print over the back of the whole garment, even over the seams. Our mockups are designed in Illustrator and/or Photoshop.
However after doing a few trial & errors attempts, I soon realized how difficult it is to have an even print. On the seams of any garment there's additional fabric causing an uneven surface, thus creating a blotchy print.
Production
I ended up running the design only on the bottom seam. Our [home] shop only has 20"x24" screens, however the design is greater than that. The length of the graphic is 28" long so I had to break down the single color screen print into two separate screens.
The largest film my Canon printer can print is 13"x19". The challenge arises when aligning both film transparencies to create one large graphic. Lining the crosshairs on both film up is easy, as shown below; however, printing them is a whole other story.
Having registration marks is a requirement to be able to line up multiple screens on press. For single color designs it is not necessary, but for an oversized print it is needed (if you have a larger platen and screen then you'd be fine).