Do you mean is there a keboard shortcut that would change the default
printer? If this is what you mean there is no shortcut on the keyboard that I
am aware of. Also, you can only have one default printer set.
You can use a script to change the default printer.
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Printer="Printer name"
Set wm=GetObject("winmgmts:\\.\root\cimv2")
Set prs=wm.ExecQuery("Select * from Win32_Printer",,48)
For Each pr in prs
If InStr(pr.Caption,Printer) Then pr.SetDefaultPrinter:Exit for
Next
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Then create a shortcut to this script and assign a hotkey to the shortcut.