That is to say, I do something like this:

# Where $can is a Canvas object,
#   and $psfile is the file to write to ...

$can->postscript(-file => $psfile);
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I haven't looked at the postscript module personally, but if it allows you to print from a file, then you could use my snippet above, followed by whatever lets you send it to your printer.

#!/usr/bin/perl
use Tk;
#to change the background color, edit the ps file
#  0.000 0.000 0.000 setrgbcolor AdjustColor
#  fill

$width = 800;
$height = 500;
my $main = MainWindow->new();
my $canvas = $main->Canvas( -width=>$width, -height=>$height, -backgro
+und=>"black");
$canvas->pack( -expand=>1,-fill=>'both');

&create;

$canvas->update;
$main->update;

$main->Button(
    -text    => "Save",
    -command => [sub {
         $canvas->update;
         my @capture=();
         my ($x0,$y0,$x1,$y1)=$canvas->bbox('all');
         @capture=('-x'=>$x0,'-y'=>$y0,-height=>$y1-$y0,-width=>$x1-$x
+0);
         $canvas -> postscript(-colormode=>'color',
                               -file=>$0.'.ps',
                   -rotate=>0,
                   -width=>800,
                   -height=>500,    
                   @capture);
                               
                  } 
   
  ]  )->pack;

MainLoop;

sub create{
$canvas->createOval(100, 100, 600, 600,-fill=>'green')
}
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To actually print, you need to send it to the printer yourself

# on linux, and you might want to fork it off so it
# dosn't block your program
system("lpr -P lp0 mypsfile.ps");  # lp1, lp2, etc
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