Wanted to create a universal mount that was extendable and versatile. This mount can be extended by printing as many of the extension mounts as desired. There are several options for connections. I'm using it for a light that has great clearance from the print area, but I can position it to shine directly on the plate and it rides up and down with the plate. The mount connections are very strong, and they are adjustable via opposing teeth at the connection points (which are hidden when assembled). Note that the ball/swivel mount is pretty solid, but I always add a ziptie to these things just because I'm paranoid.

Props to Small Ball Mounting System (i.a. for CAMs like Pi, C270, GoPro) by wolwin_de - Thingiverse for the connector he created and I added to the design. The screw and nut are M3.