Holders of printer accounts can upsell customers using featured products.
Create featured products
Go to Edit template details screen and scroll to the bottom of the screen. Check Featured option on.
What users see
A thumbnail linked to the featured product will show on order details immediately after placing an order for some other product.
Featured products are picked at random out of a pool with templates you marked as featured, but only for those not ordered before by the user. Users are not prompted with featured products they ordered before.