Homebrew PCBs

Looking for some advice from laser printer people here, since it looks 
like so many people use the toner transfer, which I would like to give 
a try.

I am using a HP Laserjet 6l found in the attic, dusty has been 
sitting.  I purchased a remanufactured toner cartridge for it (because 
I am cheap).

So now the print comes out unsatisfactory.  For example, if I print a 
black and white checkerboard on an 8.5 x 11 sheet, I see waves in the 
lines that vary contrast.  Also getting what looks like some type of 
alley down the center where some small roller hits the paper and causes 
a variance.

So I was wondering if anyone knows that if laserjet 6L printers are 
just junk - and to not bother trying to use this for anything other 
then printing letters, or I should go head and replace the fuser film, 
or possibly a NEW toner cartridge will solve the issues?