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By the end you will have a product on which customers build a gang sheet, see a live price per foot of film, and check out with the sheet attached to the order. About twenty minutes. You need: Print.App and Print Options installed on the store (Shopify installation, Print Options on Shopify), and Switch to new Editor on in the Print.App dashboard settings.
1

Create the design

In the Print.App dashboard go to Designs → Create New Design → Gang Sheet. Title it 22” DTF Gang Sheet.Under Film and billing leave the defaults: 22” wide, 120” max, 3” minimum, billed per inch. Under Pricing set Price target to po:dimensions and Price display source to po:price. Save.
2

Create the product

In Shopify add a product, 22” DTF Gang Sheet, with one variant and a nominal price — Print Options will replace it. Keep inventory tracking off; a gang sheet is made to order.
3

Assign the design

In the Print.App app on Shopify, open the product and assign the design you created. The product page now shows the Print.App button.
4

Build the option set

Open the Print Options builder for the product and start from the DTF Gang Sheet (22” film) template. It has:
  • a file field with Print.App as the provider, so the designer is the way in;
  • a Film type choice, matte and glossy, each with a Per length modifier in feet and length tiers (up to 5 ft, up to 20 ft, beyond);
  • a quantity stepper for repeat sheets;
  • a 3setupfeeanda3 setup fee and a 10 minimum.
Change the rates to yours and Publish.
5

Place the theme block

In the theme editor, add the Print Configurator app block to the product template, inside the product information section right after the price, and remove the theme’s own quantity and buy buttons — the widget’s Add to cart is the only path. Set the file field’s display to producer if you want to hide the drop zone and show only the designer button.
6

Test it

Open the product, click the Print.App button, upload three or four PNGs and set copies — 40, 30, 30, 25 makes a good test. Watch the sheet pack and Length used settle, then Preview & Save. Back on the product page the widget shows the film line, for example Matte DTF film 13” — $8.67, plus the setup fee. Add to cart and check out.
7

Find the print file

Open the order in Shopify: the line carries the design link and the film properties. In the Print.App app’s orders page download the project’s PDF — one page, 22” × 13”, transparent, every logo at full resolution.

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Variations

  • Bill per foot rounds the used length up to whole feet — set it under Film and billing and the widget’s tiers still apply.
  • Fixed sheet sizes (22” × 24”, 22” × 48”…): set Bill per to Fixed sheet lengths, list the sizes, and price the widget per sheet with a quantity-based modifier instead of per length.
  • Password-protected development store: the storefront asks for the password; the product’s Preview button in Shopify admin bypasses it for testing.