#Replace PRINTSERVER with name of the Print Server
$PrintServer = "\\PRINTSERVER"

$Printers = Get-WmiObject -Class Win32_Printer
ForEach ($Printer in $Printers) {
    If ($Printer.SystemName -like "$PrintServer") {
        (New-Object -ComObject WScript.Network).RemovePrinterConnection($($Printer.Name))
    }
}