The legacy Shopify print on demand app will never cover all the products we do - there are simply too many and they aren’t all appropriate to the average Shopify store.
The complete range of print on demand products is, however, available through our Shopify sales channel solution, Manual Order Form, and CSV uploader.
For print on demand products not featured in our legacy Shopify app, you are able to add them to the published products within the Shopify store admin area as new variants.
When an order is placed for one of these new variants, the app wouldn’t be able to automatically fulfil them, but you would then be able to place those orders using our manual order form or CSV uploader.
From your customers’ perspective, the end result would be exactly the same. Unfortunately, for the time being we wouldn’t be able to provide any product previews of those custom options for you, but we are looking to expand our preview generator to cover more products and this will soon be available outside of Shopify in the near future. You would need to manually update the orders with the tracking on shopify so the customers receive the shipping updates