Add to <punBB_root>/style/print.css:
[code=css]/* by MH */   
#brd-head, #brd-navlinks, #brd-visit,
.main-head, .main-foot,
.posthead, .post-author, .postfoot,
.main-subhead, #brd-qpost,
#brd-pagepost-top, #brd-pagepost-end, #brd-about { display:none; }

h4 { font-size:150%; }
h5 { font-size:130%; }
ul li p:before { content:"● "; margin-left:-0.8em; }
ul li { margin-left:1.2em; }
.codebox { border:1px solid black; padding:10px; overflow:visible; }

.entry-content a:link:after, .entry-content a:visited:after {
   content: " (" attr(href) ") ";
   font-size: 90%;
}[/code]

• removes most elements around the post for better printing

• better list view

• better code view

• adds URL from links within the post