Modeled with a real Xbox controller scan. Provide a much more comfortable grip on tablets while gaming. I made it specifically for playing Real Racing. 

The internal depth is 7.5 mm, and the ridges are 0.3mm tall. This fits my tablet with a tempered glass screen protector installed (~7.3mm total thickness). You may scale up or down, based on your tablet dimensions. 

The model is for the left side only. Just mirror it for the right side. 

Print vertically, with support on the build plate only. You can set the overhang threshold to 30 (the default is 50 in PrusaSlicer), making the handle part smoother. Sanding may be needed.