Summary

An incredible tablet/phone holder from AndrewFX (https://www.thingiverse.com/thing:2367305). I changed nothing except splitting the design in the centre. The whole thing would have fit on my printer vertically, (Delta Rostock @275mm Z clearance) but would have used far too much support material. So, here we are with a split. For my particular print, I embossed my name on the front, just because. But I removed it for the version uploaded here. Feel free to mod away.

I printed the pieces vertically, with the round clamp towards the print bed. Rafts selected, 15% infill. Each piece took about 90 minutes to extrude, and each half stands 121mm tall. Hopefully this will help others with smaller 140x140x140mm beds.
https://www.youtube.com/watch?v=pqZfoZa5zHQ

You can opt to superglue the pieces back together if you wish, but I found that it works fine without the glue. I had my 8" samsung tablet in the mount and the locked itself into place. Even after 2 hours of thrashing around Bathurst in the Ford V8 supercar. My actual wheel needs to be bigger to see the full screen, but I get the information I need, and the bright flashing "Change Gears!" indication.