OpenPrintSpooler is a sandbox setting that provides nuanced control over how sandboxed applications interact with the print spooler service.
.
.
.
[DefaultBox]
OpenPrintSpooler=n
This setting prevents sandboxed applications from setting up printers outside the sandbox.
The filter can be disabled by setting OpenPrintSpooler=y.
Added as part of 0.5.4 / 5.46.0 version.
See also ClosePrintSpooler.