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>forwards it to our printing service.

is the printing service a real physical service?

anyway i'm doing basically exactly this same thing except all client side (i send the serialized "label file" and data to the client) but printing is being done using the user's printer

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Yep, the printing service is a third-party api (PrintNode) that routes the request to one of any number of desktop clients.

The reason we did it this way is 1. we have a web app so we can't print directly to their printer without a print dialog, and 2. we want to print to potentially a different device than the user is on.

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