In article , "Set Square"
says...
In an earlier contribution to this discussion,
Rob Morley wrote:


How about printing it in colour on an overhead projector transparency
designed for ink-jet use - and then laminating it? You could use an
A4 laminator pouch and then trim it to size after laminating. It
won't be *quite* 12" long - but pretty close.

A4 is more than 14" on the diagonal ...

Indeed it is! So perhaps you'd like to explain how the OP can get a 12" x 4"
*rectangle* out of an A4 sheet.

I missed the 4" bit :-)