Hi folks,
I suppose someone might magic up a way of creating DIY
floppies from
scratch in a home lab, but I'm not holding my breath.
http://www.madehow.com/Volume-1/Floppy-Disk.html
http://www.mylarstoreonline.com/25ft.html
I think you want the 3mil type (assuming 3mil means 0.003", my knowledge
of non-metric units is getting rusty ;-) )
With this and some iron oxide (from China?) you have the makings of a
floppy disk - you just need a jacket and liner; something to polish it all
with and a pair of scissors (kidding).
-cheers from Julz @p