Preventing printing of spool files

I've probably asked about this before.

On some customer boxes, I occasionally run into the problem of unintended printing of spool files: it needlessly wastes their paper, and clutters printers that are often over two thousand miles away from me with stuff that's of no conceivable use to them, while denying me access to compilation listings &c.

Is there a simple way, without having to create a dummy queue or device, to guarantee that no spool files created from my user profile are ever routed to an active printer?

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JHHL