Slow-motion videos and IS troubleshooting

Almost 2 years ago when I started developing the gantry and I didn't know why my graphs were looking like shit, I got into the habit of filming my IS (Input Shaper) runs in slow-mo.

The ability to pull your phone out of your pocket and quickly shoot 240-1000 FPS vids is a very powerful, but sadly underutilized tool for input shaper troubleshooting.

Without this tool, I probably still wouldn't have noticed these things (at least not by myself):

• the VZ CNC hotend mounting system is worse than just bolting the hotend to a thicker printed part
• we can't fix bad COM with long 20x20mm profiles and a single rail
• unsupported, single-shear hotends are bad for accuracy OR need more material to get to the same rigidity as double-shear

So I encourage everyone to use this tool when investigating bad IS results.

Making someone shoot a few-second-long video to see it for themselves is much easier than convincing them about how their CNC toolhead carriage isn't enough (see pic).