Here, a few months ago, I wondered aloud what would happen if I clamped my saber saw underneath a work surface so that I could free up my hands to guide the workpiece. This would allow me, for example to do miter and notch cuts in steel quickly and accurately.
I tried it and found that I couldn't hold the workpiece down against the face of the surface for some reason. I jumped to the conclusion that I needed a larger 'orbital' blade clearance setting but even with that set for maximum 'return clearance' the work still vibrated uncontrollably. I wondered what could be the cause but vectored off to do other chores instead of engaging in any analysis.
This morning, a commercial on teevee revealed the cause. Our friends at Rockwell discovered that the blade was flopping laterally and have included an upper guide to minimize that. Apparently it works well enough, if very slowly, even in wood.
After watching the demos, I'm convinced that this approach won't work for me because of the swarf that will jam in the upper blade guide, causing damage to it in short order.
Still it is cool to see how they addressed the 'floppy blade' issue.
Now, I wonder how to make a large jigsaw that uses regular hack saw blades to do many of the things that the Blade- Runner is shown doing, without tearing up a blade guide in the process.