If you are using the built-in Printify shipping rates
All you need to do is republish products for which shipping costs were changed. Please visit My Store section in Printify > Edit listing > check the box Publish product to your Etsy store > Publish.
Please note: If you made any changes to your products from the Etsy side, after republishing, Printify system will overwrite all changes. You may want to republish the product selectively.
If you have custom shipping rates set up with Etsy
Please visit your “Shop Manager” in Etsy and choose “Listings”. From Listings, please choose a product which has to be edited and scroll down to the “Shipping” section, where you can edit the custom shipping rates.
Please note: Due to a technical limitation, partial order fulfillment is not supported by Etsy - only one tracking number will be passed on to Etsy. If the order consists of multiple shipments, we recommend sending the other tracking numbers to the customer manually via Etsy’s messaging system.