Do I have to list Grandville Printing as a production partner on Etsy?

Yes. If you're selling print on demand products on your store, Etsy's policy asks you to list your production partner.

Here's how you can do that: 

• First, visit the Settings tab, then go to Production partners, and add Grandville Printing as yours (you can make this hidden on your store page).
• Second, go to your listings and edit the “About this listing” tab to say that “Another company or person” made it.
• Then select “Grandville Printing” as the company who made that product.

Keep in mind that you don't have to publicly show Grandville Printing as your production partner, you can choose to make this information hidden for your customer.