These articles mention the printing connection (they are all linked in the
media thread):
Serial killer squad in printer probe
(Bret Christian, The Post, May 2011)
Police contacted the former owner of a screen printing business, Lee Partridge, and asked about former employees and about the screen printing process.
Police asked if any printing components had gone missing and if rope had been left out behind the business, possibly as clothes line.
Police were interested in locating the former employees and in the items used in the screen printing process which prints coloured dues on to fabric.
Two new clues to serial killer
(Bret Christian, The Post, 05 Dec 2015)
The killer is linked to screen-printing, the manual process of printing on fabric.
The Karrakatta victim was tied up with washing line. The line was impregnated with material used in screen printing.
Fresh clue in Claremont serial killer case
(News.com.au, 15 May 2011)
All sourced from The Post.
There is a comment on this website from a man who claimed to work at Lee Partridges printing business:
http://serialkillers.briancombs.net/1308/bringing-warmth-to-claremont-cold-case/#comment-1622
He says the detectives took one tool of the trade with them. When did police take the tool? When did P&P (name of the business) close down? Did you leave this comment, Peter Kurten?
(The podcast is no longer available, BTW.)