Started by customizing thing 81117. When printed, the open design bounced when tapping to record and the angle needed tweaking. I tried to customize the stand to create a closed design with a 45 degree angle but couldn't get it quite right. I ended up drawing the profile of the design on graph paper. I then created the stand design in Inkscape using measurements from the graph paper. I resized the file to 28.225% in Inkscape. I imported into Tinkercad at 100% with height equal to 64mm which is the width of the phone in case. Example printed in blue PLA on a Printrbot LC.