I wanted to mount a tablet instead of a phone to my Xbox One S controller, but the clamp didn't extend enough as it only supported devices 55mm wide to 85mm wide . I took the STL and added an additional 90mm to it so that it can clamp devices with widths of 145mm to 175mm wide (theoretically). It uses the original nut and bolt length specified by the original design.

I made this for my new Galaxy Tab S6 which comes on Friday, we'll see how it works!

It should work with the modular mounting system as well since that's what the original was based off of. https://www.thingiverse.com/thing:2194278

You'll need the rest of the parts from https://www.thingiverse.com/thing:2553522/files to make this.

Update 06/18/2020: Based on inspiration from https://www.thingiverse.com/make:435559 I got it working with an over the top setup as you can see in the new photos. To do this setup, simply follow all the previous steps, but also print up the 90mm female angle arm from the modular mounting system (here: https://www.thingiverse.com/thing:2194278). You'll need an additional M5 Nut, M5x25 bolt, and knob to attach.