I designed this quick release plate for an OPTEX OPT155 tripod. It might be compatible with other tripods, but I have not tried.

The tripod is 2nd-hand, and wanted to mount my phone on it instead of a camera. So I created the quick release plate and modified suitable phone clamp 3D designs on it.

It's just the base design for the quick release plate, so you'd need to build it up. You can pretty much mod this into anything you need it to be. Another thing I used this on is for creating a tripod mount for a laser leveler using the same tripod!

I would love to see other uses for this, and other tripod brand compatibilities.