Zakeke does not integrate the Printful mockup generator as Zakeke is a visual and live product customizer. Customers are able to create their designs and see them live on the product.
For Printful products that are shown in their exploded versions, such as the cut-sew and all-over print products (leggings, neck gaiter, totes, ...), we suggest using the real-time 3D preview that allows you to give customers a 360° view of the customized item that they zoom in on, rotate and move around.
See an example here: https://store.zakeke.com/product/leggings
Don't you have a 3D model? We can help, drop us a line at email@example.com