Trumpeter Razor Saw, Demo'd on a Mirror Models Diamond T, nice kit, low pressure molded, shows typical lots of short half-height gates, & the very fine cuts possible.

The Orange blocks are handles & interchangeable spacer blocks so you can make repeatable spaced cuts.  

Also shown, 96TPI X-Acto Saw, & a couple of other hobby saws, too rough for this style of work.