Homebrew PCBs

I noticed the the series of articles in the group's files section that
discussed modding a Lexmark printer to print toner on board material. 
He goes through a lot of effort to remove the fuser assembly and implies
a post print bake. 

This seems to be a lot of trouble so I'm reasonably confident there is a
good reason.  Is it that charge retention and toner adhesion are fairly
poor and if you use the printer's fuser it smears or removes the toner
rather than fusing it?

-- 
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Rich Osman;  POB 93167; Southlake, TX 76092 (Near DFW Airport)