PLA inside - strata cartridge's chip

The cartridges used in an old Dimension make great spools, except you don't see how much filament is inside.

After having put a PLA inside sign on it (http://www.thingiverse.com/derivative:21217), I thought to replace the useless chip instead :)

The text is a little too small, still readable but I'll improve it.
Otherwise, I may try to adapt or make something to just hold the spool alone (49-52mm dia. for the center).